Idiomatic Expression

An idiom is a phrase or expression that typically presents a figurative, non-literal meaning attached to the phrase

A type of informal language that have a meaning different from the meaning of the words in the expression.

Chadde is absent. Maybe he's feeling under the weather.

This discussion is a piece of cake.

Gosh! This trousers cost an arm and a leg.

I go shopping once in a blue moon.

I'll stop playing Roblox when pigs fly.