An expression in the usage of a language that is peculiar to itself either in having a meaning that cannot be derived from the conjoined meanings of its elements or in its grammatically atypical use of words.
Idiom:
drive a hard bargain
Meaning:
to conclude a bargain without making any concessions
Example:
Although the man drives a hard bargain, I like doing business with him.
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