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:
head off (something) or head (something) off
Meaning:
to stop something , to prevent something
Example:
The company was able to head off a strike by the union at the last minute.
List of common idioms, their meanings and examples of their usage in sentences
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.