Sometimes used for the dead-water under a ship's counter. Also, the water that by some interruption in its course, runs contrary to the direction of the tide or current, and appears like the motion of a whirlpool. Eddies in the sea not unfrequently extend their influence to a great distance, and are then merely regarded as contrary or revolving currents. It is the back-curl of the water to fill a space or vacuum formed sometimes by the faulty build of a vessel, having the after-body fuller than the fore, which therefore impedes her motion. It also occurs immediately after a tide passes a strait, where the volume of water spreads suddenly out, and curves back to the edges. The Chinese pilots call eddies, chow-chow water.