gun

Dictionary definition · gun

a weapon that discharges a missile at high velocity (especially from a metal tube or barrel)
large but transportable armament
a person who shoots a gun (as regards their ability)
a professional killer who uses a gun
a hand-operated pump that resembles a pistol; forces grease into parts of a machine
a pedal that controls the throttle valve"he stepped on the gas"
the discharge of a firearm as signal or as a salute in military ceremonies"two runners started before the gun"

Source: Open English WordNet (CC BY 4.0).