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:
dog-eat-dog
Meaning:
to be ready or willing to fight and hurt others to get what you want
Example:
It is a dog-eat-dog world in the advertising and public relations business.
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