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:
in labor
Meaning:
a woman going through childbirth
Example:
The woman was in labor for three hours.
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