An idiom is a widely used saying or expression containing a figurative meaning that differs from the phrase's literal meaning.
the choice between taking what is offered or getting nothing at all (Hobson owned a stable in the 17th century in England and always offered his customers the horse nearest the door)
The customer's were given Hobson's choice. They could buy a car of any color but only if it was black
List of common idioms, their meanings and examples of their usage in sentences
An expression in the usage of a language that is peculiar to itself either in having a meaning that cannot be derived from the conjoined meanings of its elements or in its grammatically atypical use of words.