Idioms
An idiom is a group of words, or in other words, a phrase that has a meaning different from the literal meaning of the words in it.
Idiom:
slip off
Meaning:
to go away or escape quietly or secretly
Example:
I slipped off after the lecture and went home.
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