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:
shake a leg
Meaning:
to go fast, to hurry
Example:
"You will have to shake a leg if you want to arrive at the movie on time."
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.