An idiom is a group of words, or in other words, a phrase that has a meaning different from the literal meaning of the words in it.
Idiom:
close to home
Meaning:
to be close to someone`s personal feelings or wishes or interests
Example:
My statement about the woman's work habits hit close to home and she became very quiet.
List of common idioms, their meanings and examples of their usage in sentences
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.