The crossword solution for the term BACK CURRENT is EDDY. An EDDY is a swirling body of water that moves in a circular motion, usually in a river or stream. It is created when the current of the water is disrupted by an obstacle, such as a rock or a bend in the river. Eddies can also form in the ocean when two currents meet. They are often used by fish and other aquatic animals as a safe haven from predators.