Idioms
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:
let grass grow under one's feet
Meaning:
to be idle, to be lazy, to waste time
Example:
The musician is always working hard and never lets grass grow under his feet.
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