to put or spread something over something, or to lie on the surface of something:
The light was so bright that I had to cover my eyes.
Snow covered the hillsides.
cover someone (up) with something She covered him (up) with a blanket.
cover something with something Cover the meat with a layer of cheese.
be covered with/in The bandages were covered with/in blood.
be covered by/with How much of the earth's surface is covered by/with water?