An idiom is defined as - a group of words whose meaning is different from the meanings of the individual words.
Idiom:
(not one's) cup of tea
Meaning:
(not) something that one enjoys
Example:
Modern art is not my cup of tea so I will stay home and not go to the art gallery.
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.