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:
turn off (somewhere)
Meaning:
to leave a road or path by turning right or left onto another road or path
Example:
When we arrived at the small store we turned off onto the small road.
List of common idioms, their meanings and examples of their usage in sentences
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.