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:
kangaroo court
Meaning:
an illegal court formed by a group of people to settle a dispute among themselves
Example:
There was a kangaroo court in movie after the ranchers arrested the criminal.
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.