what is a muzzle
gun muzzle - the open circular discharging end of a gun. muzzle. gun - a weapon that discharges a missile at high velocity (especially from a metal tube or barrel) opening - a vacant or unobstructed space that is man-made; they left a small opening for the cat at the bottom of the door. gunpoint, point - the gun muzzle's direction; he held me up at the point of a gun.