oil

noun:a viscous liquid derived from petroleum, especially for use as a fuel or lubricant
- The price of crude oil has a significant impact on the global economy.
noun:any of various edible liquids extracted from seeds, fruits, or nuts, used for cooking or dressing foods
- She drizzled olive oil over the salad for extra flavor.
verb:to lubricate, supply, or treat with oil
- You should oil the hinges on that door to stop them from squeaking.
verb:to fuel a vehicle or machine
- The crew oiled the generators before the night shift began.