Lubricate/ˈluːbrɪkeɪt/ Definition 1 of 4Pro Tip 1/2Machine Maintenance Lubricating machinery prevents wear and damage. Regularly lubricate the chain to keep your bike running smoothly. Pro Tip 2/2Squeak Solution Use 'lubricate' when something makes a squeaky noise due to friction. Lubricate the door hinge to stop that annoying squeak.