Read the dictionary definition of gun. All definitions for this word.
1. the discharge of a firearm as signal or as a salute in military ceremonies
1. two runners started before the gun
2. a twenty gun salute
2. a pedal that controls the throttle valve
1. he stepped on the gas
3. large but transportable armament
4. a hand-operated pump that resembles a pistol; forces grease into parts of a machine
5. a weapon that discharges a missile at high velocity (especially from a metal tube or barrel)
6. a professional killer who uses a gun
7. a person who shoots a gun (as regards their ability)
8. shoot with a gun