A device held in the hand, having a supply of grease and attached to a reservoir of pressurized air, used to force grease between adjacent moving parts of a machine, especially in the bearings of motor vehicles. [WordNet 1.5]

ack-ack gun, air gun, antiaircraft gun, assault gun, axle grease, bb gun, big gun, bofors gun, bren gun, browning machine gun, burp gun, elbow grease, electron gun, field gun, gas gun, gatling gun, goose grease, grease, grease cock, grease cup, grease monkey, grease one's palms, grease the palm, grease the wheels, gun, gun barrel, gun carriage, gun case, gun chamber, gun control, gun deck, gun dog, gun down, gun emplacement, gun enclosure, gun for, gun for hire, gun moll, gun muzzle, gun rest, gun room, gun smoke, gun trigger, gun turret, hair grease, harpoon gun, high-angle gun, hired gun, hotchkiss gun, hydropneumatic gun carriage, jump the gun, krupp gun, light machine gun, machine gun, maxim gun, minute gun, naval gun, paintball gun, quaker gun, riot gun, set gun, smoking gun, spray gun, spring gun, squirt gun, staple gun, sten gun, stun gun, submachine gun, thompson submachine gun, tommy gun, vickers' gun, vickers-maxim automatic machine gun, vickers-maxim gun, water gun, whaling gun, whitworth gun, wire gun, wire-wound gun, wool grease, zip gun