a big gun

a big gun/noise

an important or powerful person in a group or organization She's a big gun in city politics.
See also: big, gun
References in classic literature ?
No, 'cause I had a big gun,' says Joe, `and I shot the wolf dead, Uncle Jim,--solid dead--and then he went up to heaven and bit God,' says he.
An antelope rested peacefully in a bed of daisies where, perhaps, two hundred years ago a big gun belched its terror-laden messages of death, of hate, of destruction against the works of man and God alike.
From the Fountain of Wisdom in the Wonder House to' - he smiled -'a little child playing by a big gun - the world prepared my road.