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:
variety is the spice of life
Meaning:
life is made more interesting by doing new or different things
Example:
My grandmother believes that variety is the spice of life and is always starting new projects.
List of common idioms, their meanings and examples of their usage in sentences
The language peculiar to a people or to a district, community, or class