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

big gun

noun
 
/ˌbɪɡ ˈɡʌn/
 
/ˌbɪɡ ˈɡʌn/
(informal)
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  1. a person who has a lot of power or influence
See big gun in the Oxford Advanced American Dictionary
influence
verb
 
 
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