(military) The firing of a gun after the last note of the retreat, signalling the lowering of the flag at sunset; the gun thus fired.

(military) At military posts, a gun fired at the first note of reveille; the firing of this gun.

(nautical) A small two-masted vessel during the Age of Sail, typically carrying 12 guns, comprising two long guns in the chase position and ten carronades on the broadsides.

plural of gun-brig

plural of gun lobby

(informal) A tattoo machine.

(historical) A firearm that has a needle-like firing pin.

(chiefly historical) A very large shotgun used in the 19th and early 20th centuries for shooting large numbers of waterfowl for commercial harvesting operations and private sport.

A firearm, such as a shotgun or rifle, which is fired while braced against the shoulder.

(mathematics) In the Conway's Game of Life cellular automaton, any pattern that "fires" out gliders.