1. (noun) gun
a weapon that discharges a missile at high velocity (especially from a metal tube or barrel)
2. (noun) artillery, heavy weapon, gun, ordnance
large but transportable armament
3. (noun) gunman, gun
a person who shoots a gun (as regards their ability)
4. (noun) gunman, gunslinger, hired gun, gun, gun for hire, triggerman, hit man, hitman, torpedo, shooter
a professional killer who uses a gun
5. (noun) grease-gun, gun
a hand-operated pump that resembles a revolver; forces grease into parts of a machine
6. (noun) accelerator, accelerator pedal, gas pedal, gas, throttle, gun
a pedal that controls the throttle valve
"he stepped on the gas"
7. (verb) gun
the discharge of a firearm as signal or as a salute in military ceremonies
"two runners started before the gun"; "a twenty gun salute"
8. (verb) gun
shoot with a gun
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Definition of 'GUN' 
