Idioms
An idiom is a group of words, or in other words, a phrase that has a meaning other than its literal meaning of the words in it.
Idiom:
go under the knife
Meaning:
to have surgery
Example:
My father will go under the knife on Monday.
List of common idioms, their meanings and examples of their usage in sentences
The language peculiar to a people or to a district, community, or class