An idiom is a phrase or expression that has a figurative meaning [a meaning that is different from the literal meaning of the words]. It’s a cultural or language-specific phrase that doesn’t make sense if you take it word for word.
- “Break a leg” means “good luck”.
- “It’s raining cats and dogs” means “it’s raining heavily”.
Very Simple Definition:
An idiom is a phrase that means something different from the words used.
- “It’s a piece of cake” means “it’s easy”.
- “Hit the books” means “start studying”.