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What Is an Idiom? Definition and Examples

Updated on November 1, 2022StudentsWriting Tips
A blue moon behind pink clouds with the words "Once in a blue moon"

An idiom is a phrase that, when taken as a whole, has a meaning you wouldn’t be able to deduce from the meanings of the individual words. It’s essentially the verbal equivalent of using the wrong math formula but still getting the correct answer. 

The phrase “kill two birds with one stone” is an example of an idiom. Fluent and native English speakers understand that this doesn’t refer to harming birds or using stones, but that someone is completing two tasks at once. 

Our deep dive into this topic will define what an idiom is, go over the different types, help you understand how to use them in writing, and give you some examples. 

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Table of contents

What is an idiom? 

An idiom is a type of phrase or expression that has a meaning that can’t be deciphered by defining the individual words. Appropriately, the word “idiom” is derived from the ancient Greek word “idioma,” which means “peculiar phraseology.” 

And that’s exactly what it is—a phrase that’s normal to fluent speakers (every language has its idioms) but strange to others. 

People who struggle with idioms often can’t see the forest for the trees, which is itself an idiom used to describe someone who’s too involved with the details of a situation and can’t see the bigger picture at hand. It doesn’t involve any forests or trees. 

To understand idioms is to see the forest for the trees, or to look at the phrase as a whole rather than focusing on the individual words. 

4 types of idioms

Generally speaking, there are four types of idioms: pure idioms, binomial idioms, partial idioms, and prepositional idioms. Some people may consider clichés, proverbs, and euphemisms to be types of idioms as well, but we’ll explain why they are different from idioms.

1 Pure idiom

This is your typical idiom, the meaning of which can’t be deduced by its individual components. When someone says, “Spill the beans,” they’re asking someone to reveal a secret, not to pour out a can of beans. But you wouldn’t know that by looking at each word of that phrase.

2 Binomial idiom 

This idiom is a phrase that contains two words joined by a conjunction or a preposition. Some examples include “by and large” (everything considered), “dos and don’ts” (guidelines on what to do and/or avoid in a certain situation), and “heart-to-heart” (a candid conversation between two people). 

3 Partial idiom 

This idiom is one that’s been shortened into one part, with the second part generally being understood by fluent speakers. People often use the partial idiom “when in Rome,” with the understanding that the other person knows the second part: “do as the Romans do.” 

4 Prepositional idiom 

This idiom is a phrase that combines a verb and a preposition to create a verb with a distinct meaning. The phrase “agree on” is a prepositional idiom that combines the verb “agree” with the preposition “on” and is used to express that you share an opinion with someone. 

Idiom vs. cliché 

A cliché can be an idiom, but an idiom is not always a cliché. 

Clichés are expressions or phrases that are overused to the point where they lose their meaning and indicate a lack of original thought. For example, there are few people who feel better when they hear this after a breakup: “Don’t worry, there are plenty of fish in the sea.” That phrase has been used so often that it fails to have any impact.   

Idiom vs. proverb

A proverb is similar to an idiom in that its meaning can’t be deciphered by looking at the individual words, but it’s different because it’s used to give advice to someone else. 

If someone says, “Don’t cry over spilled milk,” they’re telling the other person not to worry about something that has already happened. The phrase doesn’t mean someone is crying and has nothing to do with dairy. 

So once again, a proverb can be an idiom, but an idiom is not always a proverb. 

Idiom vs. euphemism 

A euphemism is a type of idiom that’s used to discuss a sensitive or taboo topic in a polite or understated way. Even if you’re not personally made uncomfortable by a subject, there is still a chance you’re using euphemisms around it, simply because they’re common to the point of cliché. Topics like death, sex, and money have an abundance of euphemisms. For example, “he kicked the bucket” is a euphemism for “he died” (as well as an idiom).

How are idioms structured? 

It’s difficult to define an idiom’s structure because it changes from language to language, and it even varies in different regions that speak the same language. Idioms have more to do with syntax—the specific order of words or phrases—than grammar. Remember that the ancient Greek word “idioma” means “peculiar phraseology,” so the rules for how to properly structure an idiom are unique to a specific region.

Most New Yorkers understand the phrase “it’s mad brick” to mean that it’s cold, but people elsewhere in the US may not understand what the phrase means because the combination of those words is unique to New York City. 

Learning the structure of a particular region’s idioms takes time and is often achieved by speaking with people from that area. 

When are idioms used? 

A speaker or writer often uses idioms to convey a message to someone else in a more creative way. Think of them as a type of spice that prevents your conversation or writing from being too bland. So instead of saying “you’re correct” several times, you might throw in “you hit the nail on the head” or even “bingo” for a little variety. 

When are idioms used in writing? 

As mentioned above, idioms can be used to prevent your writing from appearing too dry or formal, but they can also be used to help the writer connect with the reader.

If you were writing for a Texan audience, and you wanted to describe something as large, you wouldn’t just say that. Instead, you would say it’s “bigger’n Dallas,” which means it’s very big. This shows the reader that you have a familiarity with the topic you’re writing about. 

Other types of idiomatic usage 

There is another type of idiomatic usage used by fluent English speakers, and it’s called collocations, or a combination of words that have a specific meaning. 

In English, it’s common to describe a backup of cars on the highway as “heavy traffic.” It’s not common to describe it as “crowded traffic.” Although the phrases could reasonably be interpreted the same way, the collocation “heavy traffic” simply “sounds right” to English speakers.

Why are idioms challenging for language learners? 

Idioms are challenging for language learners because their meanings can’t be deciphered from the meanings of the individual words. It’s like giving someone a jigsaw puzzle containing pieces that look like one thing, only for the finished product to be something else entirely. 

But as we mentioned before, that’s also true of people from different parts of the same country who speak the same language. 

Because there are no steadfast rules for idioms, the only way for language learners to become familiar with them is to speak with native speakers and have them explained. 

Idiom examples 

Here are some common idioms in the English language, along with their meaning.

Under the weather Meaning: Not feeling well 

Break a leg Meaning: To wish someone good luck

Once in a blue moon Meaning: Rarely 

The ball is in your court Meaning: A decision is up to you 

You can say that again Meaning: That is true 

Beat around the bush Meaning: To avoid saying something 

Hit the sack Meaning: To go to bed 

Kick the bucket Meaning: To die 

By the skin of your teeth Meaning: Barely made it 

Idiom FAQs

What is an idiom?

An idiom is a figurative phrase that, when taken as a whole, has a meaning you wouldn’t be able to deduce from the meanings of the individual words. 

How do idioms work?

Idioms work based on a language’s syntax—the particular order of words or phrases—and can vary depending on what region of a country you’re in. 

When are idioms used?

Idioms are used by a writer to make their work seem more creative and casual and help show mastery of a particular language.

What’s the difference between an idiom and a cliché? 

A cliché is a type of idiom that is so overused that its meaning loses any significance and often indicates a lack of original thought on the part of the writer. 

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