Originally Posted by LittleChief

gun (gn)
n. 1. A weapon consisting of a metal tube from which a projectile is fired at high velocity into a relatively flat trajectory.
2. A cannon with a long barrel and a relatively low angle of fire.
3. A portable firearm, such as a rifle or revolver.
4. A device resembling a firearm or cannon, as in its ability to project something, such as grease, under pressure or at great speed.
5. A discharge of a firearm or cannon as a signal or salute.
6. One, such as a hunter, who carries or uses a gun.
7. a. A person skilled in the use of a gun.
b. A professional killer: a hired gun.

8. The throttle of an engine, as of an automobile.