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:
look down on (someone or something)
Meaning:
to regard someone or something with contempt or a feeling of superiority
Example:
My cousin looks down on the activities and life of small towns.
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.