Have you ever heard someone say it’s “raining cats and dogs” and looked out the window expecting to see animals falling from the sky? That’s because they were using an idiom — a phrase that means something completely different from what the words actually say.
Idioms for kids can be confusing at first, but once you learn what they really mean, they’re actually a lot of fun. They make language more colorful, more expressive, and way more interesting than saying things the plain, boring way.
In this guide, you’ll find 40 idioms for kids, organized into easy-to-understand categories, each with a simple meaning and a fun example. Whether you’re a student learning English, a teacher looking for classroom resources, or a parent helping with homework, this list will make idioms click in no time.
Let’s jump in.
What Is an Idiom?
An idiom is a group of words that means something different from what the individual words suggest. You can’t figure out the meaning just by reading the words one by one — you have to learn the phrase as a whole.
For example, when someone says “break a leg,” they’re not telling you to hurt yourself. They’re actually wishing you good luck! That’s what makes idioms tricky — and fun.
Idioms exist in every language, and English has thousands of them. People use idioms every day in conversations, books, movies, and songs. Learning idioms helps you understand what people really mean when they talk, and it makes your own speaking and writing much more interesting.
Think of idioms as the secret codes of language. Once you learn them, you unlock a whole new level of understanding.
How Idioms Work
An idiom works by replacing a literal description with a more creative, figurative expression. Instead of saying “she studied very hard,” you might say “she hit the books.” The meaning is the same, but the idiom paints a more vivid picture.
Here’s the pattern: [Figurative phrase] = [Real meaning]
For example: “It’s a piece of cake” = “It’s very easy.” The idiom uses something familiar (cake!) to express an idea in a more memorable way.
Most idioms come from history, culture, or everyday experiences. Some are hundreds of years old, while others are fairly new. The important thing is that you can’t change the words around — “a piece of pie” doesn’t work the same way as “a piece of cake.” Idioms are fixed phrases, and you need to learn them exactly as they are.
The good news? Once you learn a few, you’ll start noticing them everywhere — in books, on TV, and in conversations with friends and family.
40 Idioms for Kids With Meanings and Examples
Animal Idioms for Kids
Animals show up in some of the most popular and fun idioms in the English language. These are easy to picture and fun to learn.
1. Raining Cats and Dogs
Meaning: Raining very heavily.
Example: “We can’t go to the park today — it’s raining cats and dogs out there!”
Fun Fact: Nobody knows exactly where this idiom came from, but it’s been used in English since the 1600s.
2. Let the Cat Out of the Bag
Meaning: To accidentally reveal a secret.
Example: “I was planning a surprise party, but my brother let the cat out of the bag.”
Fun Fact: This idiom may come from old markets where sellers would secretly swap a cat for a more expensive pig in a bag.
3. When Pigs Fly
Meaning: Something that will never happen.
Example: “Will I ever enjoy eating broccoli? Sure — when pigs fly!”
Fun Fact: Since pigs obviously can’t fly, this is a playful way of saying “that’s impossible.”
4. Hold Your Horses
Meaning: Slow down, be patient, wait a moment.
Example: “Hold your horses — let me finish explaining before you start the project.”
Fun Fact: This idiom comes from the days when people actually rode horses and needed to stop them from running ahead.
5. The Early Bird Catches the Worm
Meaning: The person who starts earliest has the best chance of success.
Example: “Let’s get to the yard sale first thing in the morning — the early bird catches the worm!”
Fun Fact: This saying has been around since at least 1605 and is one of the most recognized idioms in English.
6. Butterflies in My Stomach
Meaning: A nervous, fluttery feeling in your stomach.
Example: “I had butterflies in my stomach before my science presentation.”
Fun Fact: This idiom perfectly describes that shaky, tingly feeling you get when you’re anxious or excited.
7. Fish Out of Water
Meaning: Someone who feels uncomfortable or out of place in a situation.
Example: “On my first day at the new school, I felt like a fish out of water.”
Fun Fact: Just like a real fish would struggle out of water, this idiom describes feeling awkward in an unfamiliar environment.
Food Idioms for Kids
Food idioms are some of the easiest to remember because they use things you already know and love.
8. Piece of Cake
Meaning: Something that’s very easy to do.
Example: “That math test was a piece of cake — I finished in twenty minutes!”
Fun Fact: Eating cake is easy and enjoyable, which is why this idiom means something is effortless.
9. Spill the Beans
Meaning: To reveal a secret or share information that was supposed to stay hidden.
Example: “Come on, spill the beans — what did you get me for my birthday?”
Fun Fact: One theory says this comes from ancient Greece, where people voted by putting beans into jars.
10. Cool as a Cucumber
Meaning: Very calm and relaxed, even in a stressful situation.
Example: “She walked on stage cool as a cucumber, like she’d done it a hundred times before.”
Fun Fact: Cucumbers stay cool even in hot weather, which is where this simile-like idiom comes from.
11. In a Nutshell
Meaning: In the shortest, simplest way possible.
Example: “In a nutshell, the book is about a kid who goes on an adventure and learns to be brave.”
Fun Fact: Imagine fitting a big idea into something as tiny as a nutshell — that’s what this idiom is about.
12. Egg Someone On
Meaning: To encourage someone to do something, often something risky or silly.
Example: “His friends egged him on to jump off the diving board, even though he was scared.”
Fun Fact: This has nothing to do with actual eggs — “egg” here comes from an old word meaning “to urge.”
13. Bite Off More Than You Can Chew
Meaning: To take on more work or responsibility than you can handle.
Example: “I signed up for three clubs and a sport — I definitely bit off more than I could chew.”
Fun Fact: Picture stuffing your mouth with too much food — that’s what this idiom looks like in real life.
14. Apple of My Eye
Meaning: A person who is very special and loved deeply.
Example: “My little sister is the apple of my dad’s eye — he adores her.”
Fun Fact: This idiom is one of the oldest in English. It appears in the Bible and has been used for hundreds of years.
Weather and Nature Idioms for Kids
Nature provides some of the most vivid imagery for idioms. These expressions use weather, storms, and the outdoors to describe everyday feelings and situations.
15. Under the Weather
Meaning: Feeling sick or not well.
Example: “I’m feeling a bit under the weather today, so I’m going to stay home and rest.”
Fun Fact: This idiom may come from sailors who would go below deck when they felt seasick from bad weather.
16. Break the Ice
Meaning: To start a conversation or make people feel comfortable in an awkward situation.
Example: “The teacher played a game to break the ice on the first day of school.”
Fun Fact: Think of thick ice blocking a ship’s path — “breaking” it opens things up, just like starting a conversation.
17. Every Cloud Has a Silver Lining
Meaning: Even in a bad situation, there’s something positive to be found.
Example: “I didn’t make the basketball team, but every cloud has a silver lining — I joined drama instead and loved it.”
Fun Fact: Even the darkest rain cloud has bright sunlight shining behind it. That’s the “silver lining.”
18. A Storm in a Teacup
Meaning: A big fuss about something that’s actually not important.
Example: “The argument about whose turn it was to pick the movie was just a storm in a teacup.”
Fun Fact: Imagine a tiny teacup having a full-blown thunderstorm inside it — that’s how silly an overreaction can look.
19. Go Out on a Limb
Meaning: To take a risk or say something that might not be popular.
Example: “I’ll go out on a limb and say that the sequel is actually better than the original movie.”
Fun Fact: Picture climbing a tree and walking along a thin branch — that’s what it feels like to take a risk.
20. Barking Up the Wrong Tree
Meaning: Looking for answers or blaming someone in the wrong place.
Example: “If you think I ate the last cookie, you’re barking up the wrong tree — ask my brother!”
Fun Fact: This comes from hunting dogs that sometimes bark at a tree where the animal has already escaped from.
Body Part Idioms for Kids
The human body inspires a huge number of idioms. These expressions use heads, hands, eyes, and more to describe actions and feelings.
21. Hit the Books
Meaning: To study hard.
Example: “I have a big test tomorrow, so I need to hit the books tonight.”
Fun Fact: You’re not literally hitting anything — this idiom just means it’s time to focus on studying.
22. Keep an Eye On
Meaning: To watch something or someone carefully.
Example: “Can you keep an eye on the cookies in the oven? I don’t want them to burn.”
Fun Fact: You don’t take your eye out and place it on something — you just watch it closely!
23. Cold Feet
Meaning: To become nervous or scared about something you planned to do.
Example: “She was going to audition for the school play, but she got cold feet at the last minute.”
Fun Fact: Nobody knows exactly where this idiom comes from, but it’s been used since at least the 1800s.
24. Cost an Arm and a Leg
Meaning: To be very expensive.
Example: “Those new sneakers cost an arm and a leg — I’ll have to save up for months.”
Fun Fact: Obviously, nothing actually costs a body part. This idiom just means the price is shockingly high.
25. Put Your Foot in Your Mouth
Meaning: To say something embarrassing or inappropriate without meaning to.
Example: “I really put my foot in my mouth when I asked about her dog — I didn’t know he had passed away.”
Fun Fact: Imagine literally putting your foot in your mouth — that’s how awkward it feels to say the wrong thing.
26. Lend a Hand
Meaning: To help someone.
Example: “Can you lend me a hand carrying these boxes? They’re really heavy.”
Fun Fact: You’re not actually giving someone your hand — you’re offering your time and effort to help.
27. Break a Leg
Meaning: Good luck! (Usually said before a performance.)
Example: “You’re going to be great in the school play tonight — break a leg!”
Fun Fact: This idiom comes from theater. Saying “good luck” was considered bad luck, so actors said the opposite instead.
Everyday Life Idioms for Kids
These idioms describe common situations, decisions, and feelings that kids experience every day.
28. Hit the Nail on the Head
Meaning: To be exactly right about something.
Example: “When she said the problem was that nobody was listening, she hit the nail on the head.”
Fun Fact: Picture hammering a nail perfectly — that’s what it means to get something exactly right.
29. Actions Speak Louder Than Words
Meaning: What you do matters more than what you say.
Example: “He promised to help, but actions speak louder than words — he didn’t show up.”
Fun Fact: This is one of the most widely known idioms in the world, and it applies to almost every situation in life.
30. Don’t Cry Over Spilled Milk
Meaning: Don’t waste time being upset about something that’s already happened and can’t be changed.
Example: “I know you lost your homework, but don’t cry over spilled milk — just start over.”
Fun Fact: Once milk is spilled, you can’t put it back in the glass. This idiom reminds you to move forward.
31. The Ball Is in Your Court
Meaning: It’s your turn to make a decision or take action.
Example: “I’ve told you my idea — now the ball is in your court.”
Fun Fact: This comes from sports like tennis and basketball, where the player with the ball has to make the next move.
32. Back to Square One
Meaning: Starting over from the very beginning.
Example: “The experiment didn’t work, so we’re back to square one.”
Fun Fact: This may come from board games where landing on certain squares sends you back to the start.
33. A Blessing in Disguise
Meaning: Something that seems bad at first but turns out to be good.
Example: “Missing the bus was a blessing in disguise — I ran into my old friend at the next stop.”
Fun Fact: A “disguise” means it’s hidden, so the good thing is hiding behind something that looks bad.
34. Burning the Midnight Oil
Meaning: Staying up very late to work or study.
Example: “She was burning the midnight oil to finish her science project before the deadline.”
Fun Fact: Before electricity, people burned oil lamps to see at night. This idiom comes from that era.
School and Learning Idioms for Kids
These idioms relate to learning, studying, and school life — things every kid can relate to.
35. Learn the Ropes
Meaning: To learn how to do something new.
Example: “It took me a few weeks to learn the ropes at my new school, but now I feel right at home.”
Fun Fact: This comes from sailing, where new sailors had to learn how to handle the ship’s ropes.
36. Pass With Flying Colors
Meaning: To succeed with an excellent result.
Example: “She studied all week and passed the test with flying colors!”
Fun Fact: This comes from ships returning to port with their colorful flags flying — a sign of victory.
37. Think Outside the Box
Meaning: To think creatively and consider ideas that aren’t obvious.
Example: “The teacher told us to think outside the box for our art project — no rules, just imagination.”
Fun Fact: The “box” represents normal, expected thinking. Going outside it means being original and creative.
38. Burning Questions
Meaning: A question that you really want answered — one that’s been on your mind.
Example: “I had a burning question about how volcanoes work, so I raised my hand right away.”
Fun Fact: The “burning” part means the question feels urgent and hard to ignore, like a fire you need to put out.
39. Crack a Book
Meaning: To open a book and start studying.
Example: “You should crack a book before the spelling test — it’s only two days away.”
Fun Fact: “Crack” here means to open, like cracking open a fresh book for the first time.
40. Straight From the Horse’s Mouth
Meaning: Information that comes directly from the most reliable source.
Example: “I heard we’re getting a snow day tomorrow — and I got it straight from the horse’s mouth, the principal told me.”
Fun Fact: This idiom comes from horse racing, where the best information about a horse came from examining the horse itself.
Idiom vs Simile vs Metaphor: What’s the Difference?
Kids often confuse idioms with similes and metaphors. Here’s a simple comparison to help tell them apart:
| Feature | Idiom | Simile | Metaphor |
|---|---|---|---|
| What It Does | Uses a fixed phrase with a hidden meaning | Compares two things using “like” or “as” | Says something is something else |
| Can You Guess the Meaning? | Usually not — you have to learn it | Yes — the comparison is clear | Sometimes — it depends on the metaphor |
| Example | “Break a leg” (good luck) | “Fast as a cheetah” | “Time is money” |
| Can You Change the Words? | No — idioms are fixed phrases | Yes — you can create new similes | Yes — you can create new metaphors |
| Uses “Like” or “As”? | Sometimes, but not always | Always | Never |
The simplest way to remember: a simile compares, a metaphor equates, and an idiom hides its real meaning behind everyday words.
How to Teach Idioms to Kids
Start with idioms they already know. Kids have probably heard “piece of cake” or “raining cats and dogs” without realizing they’re idioms. Point out these familiar phrases first, and they’ll immediately see how idioms work.
Draw the idiom literally, then explain the real meaning. Have kids draw what “raining cats and dogs” or “break a leg” would look like if taken literally. It’s hilarious, memorable, and helps them understand the gap between literal and figurative meaning.
Use idioms in context. Reading a story? Point out idioms as they appear. Having a conversation? Slip in an idiom and see if kids can guess what it means. Real-world exposure is the fastest way to learn.
Create an idiom journal. Give kids a notebook where they write down new idioms they encounter, along with the meaning and their own example sentence. Over time, this builds a personal dictionary they can reference.
Play idiom matching games. Write idioms on one set of cards and their meanings on another. Have kids match them up. You can also play “idiom charades,” where one person acts out the literal meaning while others guess the idiom.
Practice Exercises
Test your knowledge of idioms for kids by filling in the blanks with the correct idiom from this article:
- It was pouring outside — it was really ____________ out there.
- That test was so easy. It was a ____________.
- “Good luck at the recital tonight!” “Thanks — ____________!”
- I’m not feeling well today. I think I’m a little ____________.
- She accidentally told everyone about the surprise party — she really ____________.
- It took me a while to ____________ at my new school, but now I know how everything works.
- I need to ____________ tonight — my history exam is tomorrow.
- I got nervous and ____________ right before my speech.
- He scored 100% on the quiz — he passed with ____________.
- “Don’t blame me for the mess — you’re ____________!”
Answer Key:
- raining cats and dogs
- piece of cake
- break a leg
- under the weather
- let the cat out of the bag
- learn the ropes
- hit the books
- got cold feet
- flying colors
- barking up the wrong tree
Frequently Asked Questions
What is an idiom for kids?
An idiom is a phrase or expression that means something different from what the individual words say. For example, “break a leg” doesn’t mean to actually break your leg — it means “good luck.” Idioms are used in everyday English conversation, and learning them helps kids understand language better and express themselves more creatively.
What are the most common idioms kids should know?
Some of the most common idioms for kids include “piece of cake” (very easy), “raining cats and dogs” (raining hard), “break a leg” (good luck), “hit the books” (study hard), “under the weather” (feeling sick), and “butterflies in my stomach” (feeling nervous). These show up frequently in conversation, books, and media that kids encounter every day.
What is the difference between an idiom and a metaphor?
An idiom is a fixed phrase with a meaning you can’t guess from the words themselves — like “spill the beans” meaning to reveal a secret. A metaphor says something is something else to create a comparison — like “time is money.” The key difference is that metaphors create comparisons you can usually figure out, while idioms have hidden meanings you need to learn.
How can I help my child learn idioms?
Start by pointing out idioms your child already hears in everyday life, such as “piece of cake” or “break a leg.” Use visual activities like drawing idioms literally, create an idiom journal where they record new phrases with meanings and examples, and play matching games. Reading books with dialogue is also a great way to expose kids to idioms in context.
Why do we use idioms?
Idioms make language more colorful, expressive, and interesting. Instead of saying “that was easy,” we say “that was a piece of cake” — which sounds more fun and memorable. Idioms also help create a sense of belonging, because knowing them shows you understand the language and culture at a deeper level. They’re part of what makes English rich and engaging.
Conclusion
Idioms for kids might seem confusing at first — but once you learn them, they make language so much more fun. From “raining cats and dogs” to “break a leg” to “piece of cake,” these 40 idioms give you a toolkit for understanding what people really mean when they talk.
The best way to learn idioms is to notice them, practice them, and use them yourself. Try slipping one into your next conversation or story — you might be surprised how naturally it fits.
For more, explore our guides on what is an idiom, what is a simile, and what is a metaphor to keep building your figurative language skills.
