A big gun is a large artillery gun or one of the largest-calibre naval guns, or a person, group or thing which is powerful, influential, or effective.
big bum
a hand gun
Its a dance gun.
You never need a gun.
Behind a Big Gun - 1904 was released on: USA: 12 March 1904
Big 5 Soprting goods or a gun store
like a gun i meaning a really big gun
a gian gun from world war 1("big bertha")
a big knife at the end of a gun./
a big gun
Remington
Artillery