To make smooth or slippery; supply or smear with some substance, especially one of an oily or greasy nature, for the purpose of diminishing friction: as, to lubricate the bearings of a machine.In photography, to coat or smear (a print) with some glazing agent, as Castile soap dissolved in alcohol, or a compound of beeswax and Venice turpentine, as a preliminary to burnishing.Slippery.