Lubricate (verb)

1. To apply a lubricant to (a machine or engine) in order to reduce friction and heat.
2. To make something slippery or smooth.

Origin:

Late middle english: from latin lubricat- "made slippery", from the verb lubricare.

Examples:

1. He lubricated the gears before turning on the machine.
2. The mechanic lubricated the engine to reduce friction.
3. You should lubricate the door hinges every six months.
4. She lubricated the needle before inserting it.
5. The gears were lubricated to prevent wear and tear.