Quick definitions from WordNet (buoy)
▸ noun: bright-colored; a float attached by rope to the seabed to mark channels in a harbor or underwater hazards
▸ verb: mark with a buoy
▸ verb: keep afloat ("The life vest buoyed him up")
▸ verb: float on the surface of water
▸ name: A surname (very rare: popularity rank in the U.S.: #38477)
▸ Also see buoy
▸ noun: bright-colored; a float attached by rope to the seabed to mark channels in a harbor or underwater hazards
▸ verb: mark with a buoy
▸ verb: keep afloat ("The life vest buoyed him up")
▸ verb: float on the surface of water
▸ name: A surname (very rare: popularity rank in the U.S.: #38477)
▸ Also see buoy