An expression in the usage of a language that is peculiar to itself either in having a meaning that cannot be derived from the conjoined meanings of its elements or in its grammatically atypical use of words.
Idiom:
carry a lot of weight with (someone or something)
Meaning:
to be very influential with someone or with a group of people
Example:
The man's education and experience carry a lot of weight in the university.
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.