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.
call off (something) or call (something) off
to cancel something
They called off the game because of the rain.
List of common idioms, their meanings and examples of their usage in sentences
Idioms are phrases which cannot be understood simply by looking at the meaning of the individual words in the phrase.