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The most important or powerful person in an enterprise or field.
[Probably from cheese.]
slang an important person
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|Noun||1.||big cheese - an important influential person; "he thinks he's a big shot"; "she's a big deal in local politics"; "the Qaeda commander is a very big fish"|
colloquialism - a colloquial expression; characteristic of spoken or written communication that seeks to imitate informal speech
important person, influential person, personage - a person whose actions and opinions strongly influence the course of events
knocker - (Yiddish) a big shot who knows it and acts that way; a boastful immoderate person
supremo - the most important person in an organization