Idioms
An idiom is a type of phrase or expression that has a meaning that can't be deciphered by defining the individual words.
Idiom:
have a run-in with (someone)
Meaning:
to have an unpleasant encounter with someone
Example:
I had a run-in with my boss that made us both feel bad.
List of common idioms, their meanings and examples of their usage in sentences
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.