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:
make a reservation
Meaning:
to reserve a seat in an airplane or restaurant etc.
Example:
I phoned the airline last night so that I could make a reservation.
List of common idioms, their meanings and examples of their usage in sentences
A group of words which have a different meaning when used together from the one they would have if you took the meaning of each word separately.