1. big cheese - Noun
2. big cheese - Phrase
an important influential person
Source: WordNethe thinks he's a big shot Source: Internet
she's a big deal in local politics Source: Internet
the Qaeda commander is a very big fish Source: Internet
The book's arrival did, however, lead to me learning that Werlin is a big cheese -- well, not exactly, rather a big cheese expert. Source: Internet
He's a big cheese with a big desk and a big door that apparently has no lock. Source: Internet