lubricate
verb [ T ] uk/ˈluː.brɪ.keɪt/ us/ˈluː.brə.keɪt/
润滑，给…加润滑油
to use a substance such as oil to make a machine operate more easily, or to prevent something sticking or rubbing
A car engine needs to be well lubricated with oil. 汽车发动机需要用油充分润滑。