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:
call in (someone) or call (someone) in
Meaning:
to ask someone for help, to call for special advice
Example:
We called in a doctor to look at the patient.
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