Idioms
The language peculiar to a people or to a district, community, or class
Idiom:
know one's stuff
Meaning:
to know about something well
Example:
The man know's his stuff and is a very good plumber.
List of common idioms, their meanings and examples of their usage in sentences
A group of words which have a different meaning when used together from the one they would have if you took the meaning of each word separately.