Idioms
An idiom is defined as - a group of words in a fixed order that has a particular meaning that is different from the meanings of each word on its own.
Idiom:
drop in (on someone)
Meaning:
to make a short or unplanned visit to someone
Example:
I want to drop in on my friend after I finish work.
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.