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:
fill (someone's) shoes
Meaning:
to substitute for someone and be able to do a satisfactory job
Example:
Although he is a good supervisor, he is unable to fill the shoes of those who came before him.
List of common idioms, their meanings and examples of their usage in sentences
Idioms can be a powerful linguistic tool only when they are used in the right way in the right places.