An idiom is a common phrase that has an alternative or figurative meaning different to the literal words being used.
An idiom is a group of words established by usage as having a meaning not deducible from those of the individual words.
An idiom is a widely used saying or expression that contains a figurative meaning that is different from the phrase's literal meaning.
For example, if you say you're feeling “under the weather,” you don't literally mean that you're standing underneath the rain.
Some examples of idioms include.
“Hit the hay.” “Sorry, guys, I have to hit the hay now!”
“Up in the air”
“Stabbed in the back”
“Takes two to tango”
“Kill two birds with one stone.”
“Piece of cake”
“Costs an arm and a leg”
“Break a leg”
A blessing in disguise. Meaning: A good thing that initially seemed bad.
A dime a dozen. Meaning: Something that is very common, not unique.