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:
step into (someone's) shoes
Meaning:
to take over a job or other role from someone
Example:
I will have to step into my supervisor's shoes while he is away on vacation.
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