As a Noun: 1. A device for forcing grease into special holes in machines so that their moving parts will work smoothly. English = grease gun. 2. Of a car, the action of examining, adjusting and cleaning it so that it will keep working efficiently and safely. English = service. As a Verb or Adjective: 1. To apply grease using a grease gun. 2. Of a car, to examine, adjust and clean it so that it will keep working efficiently and safely. English = service.