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 drag
Meaning:
wearing the clothes of the opposite sex
Example:
The couple were shocked when they went to a stage show and found many of the performers in drag.
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