The Collaborative International Dictionary
grease-gun
grease gun \grease gun\, grease-gun \grease-gun\n. 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
grease-gun
n. a hand-operated pump that resembles a gun; forces grease into parts of a machine [syn: gun]