Idioms
A group of words which have a different meaning when used together from the one they would have if you took the meaning of each word separately.
Idiom:
hung up on (someone or something)
Meaning:
to be obsessed or devoted to someone or something
Example:
My friend is hung up on one of his colleagues at work.
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.