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:
out of necessity
Meaning:
because of necessity, due to need
Example:
The library will close on Saturdays out of necessity. It has no money.
List of common idioms, their meanings and examples of their usage in sentences
An idiom is a type of phrase or expression that has a meaning that can't be deciphered by defining the individual words.