Idioms
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.
Idiom:
open up a can of worms
Meaning:
to create unnecessary complications
Example:
The dispute with our competitor opened up a can of worms about how to market our product.
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