An idiom is a widely used saying or expression containing a figurative meaning that differs from the phrase's literal meaning.
Idiom:
off the wagon
Meaning:
drinking alcohol again after stopping for a period of time
Example:
The man is off the wagon again. I saw him yesterday and I am sure that he had been drinking.
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.