Answer: lubricating

AnswerCrossword Clue
lubricatingApply a substance such as oil or grease to (an engine or component) to minimize friction and allow smooth movement
lubricatingMake (a process) run smoothly
lubricatingMake (something) slippery or smooth by applying an oily substance
lubricatingLUBRICATE, to make smooth or slippery
lubricatingMake someone convivial, esp. with alcohol