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:
get back to (someone)
Meaning:
to communicate something to someone at a later time, to contact someone later
Example:
We were very careful that our complaints did not get back to the school principal.
List of common idioms, their meanings and examples of their usage in sentences
An idiom is defined as - a group of words whose meaning is different from the meanings of the individual words.