An idiom is a type of phrase or expression that has a meaning that can't be deciphered by defining the individual words.
Idiom:
laugh all the way to the bank
Meaning:
to make money in a way that other people think is impossible
Example:
I was laughing all the way to the bank with the money that I made from selling drinks at the sports stadium.
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.