Idioms
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.
Idiom:
start up (something) or start (something) up
Meaning:
to begin operating something, to begin to play or do something
Example:
My uncle started up a small business when he was 20-years old.
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.