Idioms
An idiom is defined as - a group of words in a fixed order that has a particular meaning that is different from the meanings of each word on its own.
Idiom:
under the weather
Meaning:
feeling ill (but not seriously ill)
Example:
I am feeling under the weather so I am going to bed early tonight.
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