(1):

(v. i.) To hawk by the side of a river; to fly hawks at river fowl.

(2):

(n.) One who rives or splits.

(3):

(n.) Fig.: A large stream; copious flow; abundance; as, rivers of blood; rivers of oil.

(4):

(n.) A large stream of water flowing in a bed or channel and emptying into the ocean, a sea, a lake, or another stream; a stream larger than a rivulet or brook.