English

Definition of big gun noun from the Oxford Advanced Learner's Dictionary

 

big gun

 noun
noun
BrE BrE//ˌbɪɡ ˈɡʌn//
 
; NAmE NAmE//ˌbɪɡ ˈɡʌn//
 
(informal)
 
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a person who has a lot of power or influence
See the Oxford Advanced American Dictionary entry: big gun