Idioms
An idiom is defined as - a group of words whose meaning is different from the meanings of the individual words.
Idiom:
take a course in (something)
Meaning:
to enroll in a class to study or learn something
Example:
I am planning to take a course in photography next year.
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