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:
next-door neighbor
Meaning:
the person living in the house or apartment next to you
Example:
My next-door neighbor often brings over fresh bread that she has baked.
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.