Definitions of oil:

• noun:   oil paint used by an artist
• noun:   a slippery or viscous liquid or liquefiable substance not miscible with water
• noun:   any of a group of liquid edible fats that are obtained from plants
• verb:   cover with oil, as if by rubbing

  Example: "Oil the wooden surface"

• verb:   administer an oil or ointment to ; often in a religious ceremony of blessing