An idiom is defined as - a group of words whose meaning is different from the meanings of the individual words.
Idiom:
cliffhanger
Meaning:
a sports event or movie or election where the outcome is uncertain until the very end
Example:
The playoff game was a cliffhanger and the most exciting game of the year.
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.