big gun
noun[C]
us/ˈbɪɡ ˈɡʌn/(alsobig shot, big wheel,us/ˈbɪɡ ˌʃɑt/us/ˈbɪɡ ˈhwil,ˈwil/)someone who has animportantorpowerfulposition:
Theirlawyer, a big gun from Detroit,commissionedabunchofsurveysto show thattheirproductsmetthe state'sstandards.
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