(1):

(v. t.) To collect as into an eddy.

(2):

(n.) A current of air or water running back, or in a direction contrary to the main current.

(3):

(n.) A current of water or air moving in a circular direction; a whirlpool.

(4):

(v. i.) To move as an eddy, or as in an eddy; to move in a circle.