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.
Idiom:
throw down the gauntlet
Meaning:
to challenge someone to a fight or to do something
Example:
The government threw down the gauntlet to the opposition party and told them to stop criticizing their policies without suggesting an alternative.
List of common idioms, their meanings and examples of their usage in sentences
Idioms can be a powerful linguistic tool only when they are used in the right way in the right places.