| gun | (noun) the discharge of a firearm as signal or as a salute in military ceremonies | - |
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| (noun) a weapon that discharges a missile at high velocity (especially from a metal tube or barrel) | - |
| (noun) large but transportable armament | Synonyms: artillery, heavy weapon, ordnance |
| (noun) a hand-operated pump that resembles a pistol; forces grease into parts of a machine | Synonyms: grease gun |
| (noun) a pedal that controls the throttle valve | Synonyms: accelerator, accelerator pedal, gas, gas pedal, throttle |
| (noun) a professional killer who uses a gun | Synonyms: gun for hire, gunman, gunslinger, hired gun, hit man, hitman, shooter, torpedo, triggerman |
| (noun) a person who shoots a gun (as regards their ability) | Synonyms: gunman |
| (verb) shoot with a gun | - |
| gunboat | (noun) a small shallow-draft boat carrying mounted guns; used by costal patrols | - |
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| guncotton | (noun) a nitric acid ester; used in lacquers and explosives | Synonyms: cellulose nitrate, nitrocellulose, nitrocotton |
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| gunfight | (noun) a fight involving shooting small arms with the intent to kill or frighten | Synonyms: gunplay, shootout |
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| gunfire | (noun) the act of shooting a gun | Synonyms: gunshot |
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| gunflint | (noun) the piece of flint that provides the igniting spark in a flintlock weapon | - |
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| gunite | (noun) a mixture of cement and sand and water that is sprayed on a surface under pneumatic pressure | - |
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| gunk | (noun) any thick, viscous matter | Synonyms: goo, gook, goop, guck, muck, ooze, slime, sludge |
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| gunlock | (noun) the action that ignites the charge in a firearm | Synonyms: firing mechanism |
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| gunman | (noun) a professional killer who uses a gun | Synonyms: gun, gun for hire, gunslinger, hired gun, hit man, hitman, shooter, torpedo, triggerman |
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| (noun) a person who shoots a gun (as regards their ability) | Synonyms: gun |
| gunmetal | (noun) a type of bronze used for parts subject to wear or corrosion (especially corrosion by sea water) | - |
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| gunnel | (noun) small eellike fishes common in shallow waters of the northern Atlantic | Synonyms: bracketed blenny |
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| (noun) wale at the top of the side of boat; topmost planking of a wooden vessel | Synonyms: gun rest, gunwale |
| gunner | (noun) a serviceman in the artillery | Synonyms: artilleryman, cannoneer, machine gunner |
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| gunnery | (noun) guns collectively | - |
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| gunny | (noun) coarse jute fabric | Synonyms: burlap |
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| gunnysack | (noun) a bag made of burlap | Synonyms: burlap bag, gunny sack |
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| gunplay | (noun) a fight involving shooting small arms with the intent to kill or frighten | Synonyms: gunfight, shootout |
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| gunpoint | (noun) the gun muzzle's direction | Synonyms: point |
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| gunpowder | (noun) a mixture of potassium nitrate, charcoal, and sulfur in a 75:15:10 ratio which is used in gunnery, time fuses, and fireworks | Synonyms: powder |
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| gunrunner | (noun) a smuggler of guns | Synonyms: arms-runner |
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| gunrunning | (noun) the smuggling of guns and ammunition into a country secretly and illegally | - |
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| gunshot | (noun) the act of shooting a gun | Synonyms: gunfire |
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| gunsight | (noun) a sight used for aiming a gun | Synonyms: gun-sight |
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| gunslinger | (noun) a professional killer who uses a gun | Synonyms: gun, gun for hire, gunman, hired gun, hit man, hitman, shooter, torpedo, triggerman |
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| gunsmith | (noun) someone who makes or repairs guns | - |
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| gunstock | (noun) the handle of a handgun or the butt end of a rifle or shotgun or part of the support of a machine gun or artillery gun | Synonyms: stock |
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| gunwale | (noun) wale at the top of the side of boat; topmost planking of a wooden vessel | Synonyms: gun rest, gunnel |
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