Idioms
An idiom is a type of phrase or expression that has a meaning that can't be deciphered by defining the individual words.
Idiom:
in with (someone)
Meaning:
in friendship or favor or closeness with someone
Example:
The boy was in with the wrong group of people when he went to high school.
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.