big gun

Noun

1.

big gun - 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" Synonyms: big cheese, big deal, big enchilada, big fish, big shot, big wheel, head honcho

big cheese, big deal, big enchilada, big fish, big shot, big wheel, colloquialism, head honcho, important person, influential person, knocker, personage, supremo