lubricate

Concise Oxford English Dictionary © 2008 Oxford University Press:
lubricate /ˈluːbrɪkeɪt/

▶verb

• 1 apply oil or grease to (an engine or component) to minimize friction.

• 2 informal make convivial with alcohol.

– derivatives
lubrication noun,
lubricator noun.

– origin C17: from L. lubricat-, lubricare ‘make slippery’, from lubricus ‘slippery’.