Animal Idioms In English: 6 Common Expressions

07/03/2026

Written By Amy Smith

Why Are Idioms Important for English Learners?

As most English learners know, idioms can be challenging to learn, but they can have a huge impact on your fluency and understanding of natural English.

Many native and advanced English speakers use idioms regularly, so they are an important area to focus on once you reach B1 level or higher.

Idioms are also unique because they do not usually translate directly into other languages. This can make learning them interesting, and sometimes even humorous!



Find out exactly how to learn advanced vocabulary like idioms and phrasal verbs, in my ebook "Advanced Vocabulary Made Simple".

Something to Consider When Learning Idioms

It is important to give yourself time and make sure you have enough meaningful exposure to each new expression.

This is true for all new vocabulary, but it is especially important with idioms, because the meaning is often completely different from the individual words.

Below are six common animal idioms in English.

They all include animals, but remember: the meaning of the idiom is not related to the animal itself.


6 Common Animal Idioms in English: 

1. A Pet Peeve

Meaning: Something that you find particularly annoying.

Example:
"Lateness is a pet peeve of mine."

2. To Watch Someone Like a Hawk

Meaning: To watch someone very closely.

Example:
"I feel like my boss has been watching me like a hawk since I made that little mistake."

3. Straight from the Horse's Mouth

Meaning: Information that comes directly from the original source.

Example:
"She's definitely leaving — I heard it straight from the horse's mouth."

4. A Nest Egg

Meaning: A sum of money saved for the future.

Example:
"My parents have a nest egg that they are saving for retirement."

5. A Dark Horse

Meaning: Someone with a surprising or unexpected ability or skill.

Example:
"He was definitely the dark horse of the competition. No one expected him to win!"

6. In the Dog House

Meaning: In trouble with someone.

Example:
"I've been in the dog house with my wife since I forgot our anniversary."

(This expression is often used humorously when a man angers his wife.)



Regular speaking practice will increase your exposure to idioms, and give you the chance to practise those that you already know. 

My conversation classes are a great way to do this!

Frequently Asked Questions About Animal Idioms 

What are animal idioms in English?

Animal idioms are expressions that include the name of an animal but have a meaning that is different from the literal words. For example, "watch someone like a hawk" means to watch someone very carefully. 

Why are idioms difficult for English learners?

Idioms can be difficult because their meaning usually cannot be understood from the individual words. They also often do not translate directly into other languages. 

When should English learners start learning idioms?

Most learners start studying idioms around B1 or intermediate level, when they already have a solid foundation of grammar and vocabulary.

How can I learn English idioms faster?

The best way to learn idioms is through regular exposure and practice. Reading, listening to native speakers, and using idioms in conversation can help you remember them more easily.

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