An idiom is a group of words, or in other words, a phrase that has a meaning other than its literal meaning of the words in it.
Idiom:
lover's lane
Meaning:
a hidden road or walkway where lovers walk or park their cars in the evening
Example:
After the movie we drove to the local lover`s lane.
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.