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English definition of “big gun”

big gun

noun [C]  /ˈbɪɡ ˈɡʌn/ ( also big shot, big wheel,  /ˈbɪɡ ˌʃɑt/  /ˈbɪɡ ˈhwil, ˈwil/) us  
someone who has an important or powerful position: Their lawyer, a big gun from Detroit, commissioned a bunch of surveys to show that their products met the state's standards.
(Definition of big gun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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