the eddy water closing in under a ship's stern when sailing.
See also: Dead
dead water
dead water
[′ded ‚wȯd·ər] (oceanography) The mass of eddying water associated with formation of internal waves near the keel of a ship; forms under a ship of low propulsive power when it negotiates water which has a thin layer of fresher water over a deeper layer of more saline water.