You’ve probably heard someone say “it’s raining cats and dogs” and never once pictured animals falling from the sky. That’s the magic of an idiom — a phrase that means something completely different from its literal words.
Idioms are everywhere. They pop up in everyday conversations, books, movies, and songs. Understanding what is an idiom can sharpen your English skills, improve your writing, and help you sound more like a native speaker.
In this guide, you’ll get a clear idiom definition, explore 40+ real examples with meanings and sentences, learn how idioms differ from similes and metaphors, and even test yourself with fun practice exercises. Whether you’re a student, a writer, or an English learner, this article has you covered.
Let’s break it all down.
What Is an Idiom?
An idiom is a phrase or expression whose meaning cannot be understood from the individual words alone. When someone says “break a leg,” they’re not wishing you harm — they’re wishing you good luck. That gap between the literal words and the actual meaning is what makes it an idiom.
Here’s a simple idiom definition you can remember:
Idiom (noun): A commonly used phrase or expression that has a figurative meaning different from its literal meaning.
The word “idiom” comes from the Greek word idioma, meaning “a peculiar expression” or “special feature.” It entered English in the late 16th century through Latin and French.
Every language has its own idioms, and they often don’t translate directly. That’s what makes them tricky for language learners — but also what makes them so colorful and fun.
To use the word idiom in a sentence: “The phrase ‘kick the bucket’ is a well-known English idiom that means to die.”
How Do You Spell Idiom?
This is a common question, and it’s easy to see why. The spelling trips people up.
The correct spelling is I-D-I-O-M — idiom. Five letters. Three syllables: id·i·om (pronounced ID-ee-uhm).
Common misspellings include “ideom,” “idium,” and “idiome.” Just remember: it starts with “id-” (like “idea”) and ends with “-om” (like “from” without the “fr”).
How Idioms Work
Idioms work because people in a language community agree on what a phrase means — even when the words themselves don’t add up logically. They’re a shared code.
Think of it this way. If you told someone learning English to “hit the books,” they might picture someone literally punching a stack of textbooks. But any fluent English speaker knows it simply means to study hard.
There’s no formula or pattern you can use to decode an idiom. Unlike similes (which use “like” or “as”) or metaphors (which say something is something else), idioms don’t follow grammatical clues. You learn them through exposure, context, and practice.
Here’s what sets idioms apart from other figurative language:
- The meaning is not literal. “Spill the beans” has nothing to do with beans.
- The phrase is fixed. You say “break a leg,” not “break an arm” or “fracture a leg.”
- Context matters. Idioms make sense in conversation because the situation gives them meaning.
- They’re culturally rooted. Idioms often reflect the history, values, or humor of a culture.
Idiom Definition for Kids
If you’re explaining idioms to a younger audience, keep it simple and fun.
Kid-friendly definition: An idiom is a group of words that means something different from what the words actually say. It’s like a secret code that everyone in the language already knows!
Here’s a way to explain it:
Imagine your teacher says, “This test will be a piece of cake.” Does she mean the test is made of flour and frosting? Of course not! She means the test will be easy. That’s an idiom.
Easy idiom examples for kids:
| Idiom | What Kids Might Think | What It Really Means |
| It’s raining cats and dogs | Pets falling from the sky! | It’s raining very hard |
| Hold your horses | Grab onto some horses | Wait, be patient |
| Hit the hay | Punch some hay | Go to bed |
| Under the weather | Standing under a cloud | Feeling sick |
| Break a leg | Ouch! | Good luck |
| Let the cat out of the bag | Free the cat | Reveal a secret |
A fun activity for kids is to draw the literal meaning of an idiom, then write the real meaning underneath. It helps them remember the phrase and understand the difference between figurative and literal language.
40+ Common Idiom Examples With Meanings
Now let’s explore some of the most widely used English idioms. Each entry includes the idiom meaning, two example sentences, and alternative ways to express the same idea.
We’ve organized them into six thematic groups so you can find exactly what you need.
Everyday Life Idioms
1. Break the Ice
Meaning: To initiate conversation or ease social tension in an awkward situation.
Example Sentences:
- The new student told a joke to break the ice on her first day.
- A simple compliment is a great way to break the ice at a networking event.
Other Ways to Say It: Warm things up / Get the ball rolling / Start a conversation
2. Hit the Nail on the Head
Meaning: To describe something exactly right or to be perfectly accurate.
Example Sentences:
- When she said the project failed because of poor communication, she hit the nail on the head.
- You really hit the nail on the head with that analysis of the movie.
Other Ways to Say It: Spot on / Right on the money / Nailed it
3. Burn the Midnight Oil
Meaning: To work or study late into the night.
Example Sentences:
- He burned the midnight oil finishing his thesis before the deadline.
- If you want to pass the bar exam, you’ll need to burn the midnight oil for the next few months.
Other Ways to Say It: Pull an all-nighter / Work into the wee hours / Stay up late working
4. Bite the Bullet
Meaning: To face a difficult or unpleasant situation with courage.
Example Sentences:
- She finally bit the bullet and scheduled her dentist appointment.
- Sometimes you just have to bite the bullet and have that tough conversation.
Other Ways to Say It: Face the music / Take the plunge / Grin and bear it
5. A Piece of Cake
Meaning: Something that is very easy to do.
Example Sentences:
- The math quiz was a piece of cake — I finished it in five minutes.
- Once you learn the basics, riding a bike becomes a piece of cake.
Other Ways to Say It: Easy as pie / A walk in the park / A breeze
6. The Ball Is in Your Court
Meaning: It’s your turn to make a decision or take action.
Example Sentences:
- I’ve made my offer — the ball is in your court now.
- We’ve done everything we can. The ball is in their court.
Other Ways to Say It: It’s your move / It’s up to you / Over to you
7. Back to Square One
Meaning: To start over from the beginning after a setback.
Example Sentences:
- The client rejected the design, so we’re back to square one.
- After the experiment failed, the scientists went back to square one.
Other Ways to Say It: Start from scratch / Begin again / Go back to the drawing board
Animal Idioms
Animals inspire some of the most vivid idioms in English. For even more, check out our complete guide to animal idioms.
8. Let the Cat Out of the Bag
Meaning: To accidentally reveal a secret.
Example Sentences:
- He let the cat out of the bag about the surprise party when he mentioned the cake.
- Don’t let the cat out of the bag — we haven’t told her about the promotion yet.
Other Ways to Say It: Spill the beans / Give the game away / Blow the secret
9. The Elephant in the Room
Meaning: An obvious problem or issue that everyone is avoiding.
Example Sentences:
- Nobody mentioned the company’s falling profits — it was the elephant in the room.
- Let’s address the elephant in the room: we’re behind schedule.
Other Ways to Say It: The unspoken issue / The obvious problem / What no one wants to discuss
10. Kill Two Birds With One Stone
Meaning: To accomplish two things with a single action.
Example Sentences:
- By biking to work, I kill two birds with one stone — I save gas and get exercise.
- She killed two birds with one stone by combining her vacation with a business trip.
Other Ways to Say It: Hit two targets at once / Get a two-for-one / Solve two problems at once
11. When Pigs Fly
Meaning: Something that will never happen.
Example Sentences:
- He said he’d clean his room, but I’ll believe it when pigs fly.
- We’ll finish this project on time? Sure, when pigs fly.
Other Ways to Say It: Not in a million years / That’ll be the day / Don’t hold your breath
12. Hold Your Horses
Meaning: Be patient; slow down.
Example Sentences:
- Hold your horses — we haven’t finished checking the numbers yet.
- I know you’re excited, but hold your horses and read the instructions first.
Other Ways to Say It: Pump the brakes / Cool your jets / Take it easy
13. Straight From the Horse’s Mouth
Meaning: Information received directly from the most reliable source.
Example Sentences:
- I heard the news straight from the horse’s mouth — the manager told me herself.
- Don’t trust the rumors. Get the facts straight from the horse’s mouth.
Other Ways to Say It: From the source / Firsthand / Directly from the authority
14. Barking Up the Wrong Tree
Meaning: To pursue a mistaken or misguided course of action.
Example Sentences:
- If you think I took your lunch, you’re barking up the wrong tree.
- The detective realized he’d been barking up the wrong tree all along.
Other Ways to Say It: On the wrong track / Looking in the wrong place / Missing the mark
For more expressions featuring our furry friends, explore dog idioms,cat idioms, and bird idioms.
Weather Idioms
15. It’s Raining Cats and Dogs
Meaning: It’s raining extremely hard.
Example Sentences:
- We had to cancel the picnic because it was raining cats and dogs.
- Take an umbrella — it’s supposed to rain cats and dogs this afternoon.
Other Ways to Say It: Pouring buckets / Coming down in sheets / A torrential downpour
16. Under the Weather
Meaning: Feeling sick or unwell.
Example Sentences:
- I’m feeling a bit under the weather today, so I’ll work from home.
- She’s been under the weather all week with a cold.
Other Ways to Say It: Not feeling well / Out of sorts / A little off
17. Every Cloud Has a Silver Lining
Meaning: There’s something positive in every bad situation.
Example Sentences:
- Losing that job was tough, but every cloud has a silver lining — I found a better one.
- The trip was rained out, but every cloud has a silver lining; we discovered a great indoor market.
Other Ways to Say It: Look on the bright side / There’s always a positive / A blessing in disguise
18. Steal Someone’s Thunder
Meaning: To take credit for someone else’s achievement or take attention away from them.
Example Sentences:
- He stole my thunder by announcing my idea before I had the chance.
- Don’t steal her thunder — let her share the good news herself.
Other Ways to Say It: Upstage someone / Take the spotlight / Rain on someone’s parade
19. A Storm in a Teacup
Meaning: A lot of fuss or worry over something unimportant.
Example Sentences:
- The argument about the seating arrangement was just a storm in a teacup.
- Don’t worry about the complaint — it’s a storm in a teacup.
Other Ways to Say It: Making a mountain out of a molehill / Much ado about nothing / A tempest in a teapot
Body Part Idioms
20. Cost an Arm and a Leg
Meaning: To be extremely expensive.
Example Sentences:
- That designer handbag costs an arm and a leg.
- Fixing the car engine cost an arm and a leg, but it was worth it.
Other Ways to Say It: Break the bank / A fortune / Pay through the nose
21. Keep Your Eyes Peeled
Meaning: To watch carefully for something.
Example Sentences:
- Keep your eyes peeled for a parking spot — this lot fills up fast.
- The hikers kept their eyes peeled for wildlife along the trail.
Other Ways to Say It: Stay alert / Keep a lookout / Watch closely
22. Give Someone the Cold Shoulder
Meaning: To intentionally ignore or be unfriendly to someone.
Example Sentences:
- After the argument, she gave him the cold shoulder for a week.
- I tried to apologize, but he gave me the cold shoulder.
Other Ways to Say It: Ignore someone / Shut someone out / Turn your back on someone
23. Put Your Foot in Your Mouth
Meaning: To say something embarrassing or inappropriate by mistake.
Example Sentences:
- I really put my foot in my mouth when I asked about her ex-husband at the party.
- He tends to put his foot in his mouth during job interviews.
Other Ways to Say It: Make a blunder / Say the wrong thing / Stick your foot in it
24. Get Something Off Your Chest
Meaning: To share something that has been bothering you.
Example Sentences:
- I need to get something off my chest — I’ve been stressed about the project for weeks.
- She felt better after getting her frustrations off her chest.
Other Ways to Say It: Open up / Speak your mind / Come clean
25. Keep Your Chin Up
Meaning: To stay positive and not lose hope during a difficult time.
Example Sentences:
- I know the job search is tough, but keep your chin up — something will come along.
- She kept her chin up through the entire recovery process.
Other Ways to Say It: Stay strong / Don’t lose heart / Hang in there
26. Bite Your Tongue
Meaning: To stop yourself from saying something you want to say.
Example Sentences:
- I had to bite my tongue when my boss took credit for my work.
- Sometimes it’s better to bite your tongue than start an argument.
Other Ways to Say It: Hold your peace / Zip your lips / Keep quiet
Food Idioms
27. Spill the Beans
Meaning: To reveal secret information.
Example Sentences:
- Come on, spill the beans — what did they say about the promotion?
- She accidentally spilled the beans about the surprise wedding.
Other Ways to Say It: Let the cat out of the bag / Give it away / Blow the whistle
28. Butter Someone Up
Meaning: To flatter someone to gain a favor.
Example Sentences:
- He’s been buttering up the manager all week, hoping for a raise.
- Don’t try to butter me up — I’m not changing the deadline.
Other Ways to Say It: Sweet-talk / Lay it on thick / Charm someone
29. Cry Over Spilled Milk
Meaning: To waste time being upset about something that has already happened and can’t be changed.
Example Sentences:
- Yes, we lost the contract, but there’s no use crying over spilled milk.
- She told herself not to cry over spilled milk and moved on.
Other Ways to Say It: Dwell on the past / Beat a dead horse / Worry about what’s done
30. Have a Lot on Your Plate
Meaning: To have a large number of tasks or responsibilities.
Example Sentences:
- I can’t take on another project right now — I already have a lot on my plate.
- Between school and work, she has a lot on her plate this semester.
Other Ways to Say It: Swamped / Overwhelmed / Juggling a lot
31. In a Nutshell
Meaning: In summary; briefly.
Example Sentences:
- In a nutshell, the proposal was rejected because the budget was too high.
- That’s the whole story in a nutshell.
Other Ways to Say It: In short / To sum it up / In brief
32. Take It With a Grain of Salt
Meaning: To not take something too seriously; to be skeptical.
Example Sentences:
- He exaggerates a lot, so take his stories with a grain of salt.
- Online reviews should always be taken with a grain of salt.
Other Ways to Say It: Be skeptical / Don’t take it literally / Consider the source
Time and Money Idioms
33. Time Flies
Meaning: Time seems to pass very quickly.
Example Sentences:
- I can’t believe it’s December already — time flies!
- Time flies when you’re having fun at the beach.
Other Ways to Say It: Where did the time go / Time slipped away / The hours vanished
34. Beat Around the Bush
Meaning: To avoid getting to the point; to talk about something indirectly.
Example Sentences:
- Stop beating around the bush and tell me what happened.
- She beat around the bush for ten minutes before admitting she’d lost the keys.
Other Ways to Say It: Avoid the point / Dodge the question / Skirt the issue
35. Burn a Hole in Your Pocket
Meaning: To have money that you’re eager to spend.
Example Sentences:
- His birthday money was burning a hole in his pocket the moment he got it.
- That bonus is burning a hole in her pocket — she’s already shopping online.
Other Ways to Say It: Itching to spend / Can’t wait to shop / Money is calling
36. At the Drop of a Hat
Meaning: Immediately; without any hesitation.
Example Sentences:
- She’d travel to Paris at the drop of a hat if she could.
- He’s the kind of friend who’ll help you move at the drop of a hat.
Other Ways to Say It: In an instant / Without a second thought / Right away
37. Once in a Blue Moon
Meaning: Very rarely.
Example Sentences:
- We only see each other once in a blue moon since she moved abroad.
- He cleans his room once in a blue moon.
Other Ways to Say It: Hardly ever / Seldom / On rare occasions
38. Better Late Than Never
Meaning: It’s better to do something late than not do it at all.
Example Sentences:
- You finally started exercising? Well, better late than never!
- The apology came months later, but better late than never.
Other Ways to Say It: At least it happened / Finally / It’s never too late
39. Throw Money Down the Drain
Meaning: To waste money on something useless.
Example Sentences:
- Buying that broken car was like throwing money down the drain.
- Don’t throw your money down the drain on overpriced subscriptions you never use.
Other Ways to Say It: Waste money / Pour money into nothing / Flush cash away
40. Call It a Day
Meaning: To stop working or end an activity.
Example Sentences:
- We’ve been painting for six hours — let’s call it a day.
- After three rounds of edits, the team decided to call it a day.
Other Ways to Say It: Wrap it up / Pack it in / Finish up
41. Hit the Ground Running
Meaning: To begin something with great energy and enthusiasm right away.
Example Sentences:
- The new manager hit the ground running with three new initiatives in her first week.
- If you want to succeed in this role, you’ll need to hit the ground running.
Other Ways to Say It: Jump right in / Start strong / Get off to a fast start
42. Go the Extra Mile
Meaning: To do more than what is expected or required.
Example Sentences:
- She always goes the extra mile for her clients, which is why they keep coming back.
- If you want to stand out, go the extra mile on your assignments.
Other Ways to Say It: Give 110% / Do above and beyond / Put in extra effort
Idioms vs. Similes vs. Metaphors vs. Proverbs
Idioms are just one type of figurative language. People often confuse them with similes, metaphors, and proverbs. Here’s a clear breakdown.
| Feature | Idiom | Simile | Metaphor | Proverb |
| Definition | A fixed phrase with a figurative meaning | A comparison using “like” or “as” | A direct comparison saying one thing is another | A short, wise saying that offers advice |
| Literal Meaning? | No — meaning is unrelated to the words | Partially — compares two real things | No — implies identity between two things | Sometimes — may be literal or figurative |
| Structure Clue? | None — must be learned | Uses “like” or “as” | Says X is Y | Often a complete sentence with a moral |
| Example | “Break a leg” (good luck) | “Brave as a lion” | “Time is money” | “Actions speak louder than words” |
| Can You Guess the Meaning? | Usually not | Usually yes | Often yes | Usually yes |
Key differences to remember:
A simile gives you a signal — the words “like” or “as” tell you a comparison is coming. A metaphor makes a bolder claim by saying one thing is another thing. An idiom plays by no such rules. You either know what “break a leg” means or you don’t.
Proverbs are a bit different. They’re short statements that give advice or share a general truth. Some proverbs are also idioms (like “don’t cry over spilled milk”), but not all idioms are proverbs.
For a deeper dive into how these compare, check out our guide on what is an analogy.
How to Use Idioms in Your Writing
Idioms can make your writing feel lively, natural, and relatable — if you use them well. Here are some practical tips.
Do’s
Use idioms in dialogue. Characters sound more natural when they use everyday expressions. “She told him to break a leg before his audition” feels more real than “She wished him well.”
Match the tone. Idioms are usually informal. They work beautifully in blog posts, fiction, personal essays, and casual emails. They add personality and warmth.
Pick idioms your audience knows. Stick to well-known expressions. If your readers have to Google the idiom, it’s not doing its job.
Use them sparingly. One or two idioms per paragraph is plenty. Overusing them makes your writing feel cluttered and clichéd.
Don’ts
Don’t mix idioms. Saying “we’ll burn that bridge when we come to it” mixes “burn bridges” and “cross that bridge.” It sounds confusing.
Don’t force them. If an idiom doesn’t fit naturally, leave it out. Forced idioms feel awkward and break the flow.
Don’t use idioms in academic writing. Formal essays, research papers, and technical documents call for precise, literal language. Save idioms for creative and informal contexts.
Don’t assume universal understanding. If you’re writing for an international audience, remember that idioms often don’t translate. “Kick the bucket” means nothing in many other languages.
When to Use Idioms
| Context | Use Idioms? | Why |
| Fiction / creative writing | ✅ Yes | Adds voice and personality |
| Blog posts and articles | ✅ Yes | Makes content relatable |
| Casual emails and messages | ✅ Yes | Feels natural and friendly |
| Academic essays | ❌ No | Too informal |
| Legal or technical writing | ❌ No | Could cause confusion |
| International communication | ⚠️ Carefully | Many idioms don’t translate |
Idioms Around the World
Every language has idioms, and they’re often wonderfully strange. Here are some favorites from around the world.
| Language | Idiom (Translated) | Literal Meaning | Actual Meaning |
| French | “Avoir le cafard” | To have the cockroach | To feel depressed |
| German | “Ich verstehe nur Bahnhof” | I only understand train station | I don’t understand anything |
| Spanish | “Ser pan comido” | To be eaten bread | To be very easy (like “a piece of cake”) |
| Japanese | “猿も木から落ちる” | Even monkeys fall from trees | Everyone makes mistakes |
| Italian | “In bocca al lupo” | In the mouth of the wolf | Good luck (like “break a leg”) |
| Portuguese | “Água mole em pedra dura, tanto bate até que fura” | Soft water on hard stone, hits until it pierces | Persistence pays off |
| Swedish | “Att glida in på en räkmacka” | To slide in on a shrimp sandwich | To have it easy without working for it |
These examples show that while every culture has its own idioms, the feelings and ideas behind them are universal. We all talk about luck, difficulty, persistence, and confusion — we just use different images to express them.
Practice Exercises
Test what you’ve learned! Fill in the blanks with the most fitting idiom from this article.
- I have so many assignments due this week. I really have __________.
- He always exaggerates, so I __________ whatever he says.
- We haven’t spoken in years. We only talk __________.
- She __________ and told everyone about the birthday surprise.
- Stop __________ and just tell me the truth.
- It’s __________ outside — don’t forget your raincoat!
- That vacation __________, but it was worth every penny.
- I’ve been __________ all night studying for the exam.
- Don’t worry about the mistake. There’s no point in __________.
- After the redesign was rejected, we went __________.
- The presentation was hard, but she had to __________ and do her best.
- Getting promoted was __________ — she barely had to try.
Answer Key
- a lot on my plate
- take it with a grain of salt
- once in a blue moon
- spilled the beans / let the cat out of the bag
- beating around the bush
- raining cats and dogs
- cost an arm and a leg
- burning the midnight oil
- crying over spilled milk
- back to square one
- bite the bullet
- a piece of cake
Frequently Asked Questions
What is an idiom in simple words?
An idiom is a common phrase that means something different from what the words literally say. For example, “break a leg” doesn’t mean to injure yourself — it means “good luck.” Idioms are used in everyday conversation to express ideas in a colorful, familiar way.
What is the difference between an idiom and a metaphor?
A metaphor directly compares two things by saying one thing is another (e.g., “time is money”). An idiom is a fixed expression whose meaning can’t be guessed from the words (e.g., “spill the beans” means to reveal a secret). Some metaphors become idioms over time, but not all idioms are metaphors.
How many idioms are there in English?
There’s no exact count, but most language experts estimate there are over 25,000 idiomatic expressions in the English language. Of those, a few hundred are commonly used in everyday conversation. You don’t need to learn all of them — focusing on the most common ones will take you a long way.
Can idioms be used in formal writing?
Generally, no. Idioms are considered informal and are best suited for creative writing, blog posts, fiction, and casual communication. In academic papers, business reports, or legal documents, it’s better to use clear, literal language.
Why are idioms so hard for English learners?
Idioms are challenging because you can’t figure out their meaning by looking at the individual words. They must be learned as complete phrases, and many are rooted in cultural history that non-native speakers may not share. The best way to learn them is through reading, listening, and practicing in context.
What is the most common English idiom?
There’s no single “most common” idiom, but some of the most frequently used include “a piece of cake,” “break the ice,” “hit the nail on the head,” “under the weather,” and “once in a blue moon.” These come up regularly in spoken and written English.
Conclusion
So, what is an idiom? It’s a phrase that says one thing but means another — a colorful shortcut that makes language richer and more expressive. From “spill the beans” to “once in a blue moon,” idioms are woven into the fabric of everyday English.
Understanding the idiom definition and learning how to use these expressions will make you a stronger writer, a better communicator, and a more confident English speaker.
Try working a few of these idioms into your next conversation or piece of writing. And if you’d like to explore more figurative language, check out our guides on what is a simile,what is a metaphor, and our popular animal idioms collection for even more inspiration.
