sea puss

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A strong seaward current, a riptide or undertow, especially as results when a sandbar formed by waves suddenly gives way, and which is dangerous to swimmers.
• noun The (flowing) channel which results when a cut is deliberately made by humans in a barrier beach which separates a bay from an ocean, so as to control the water level in the bay (which affects water mills) and its salinity (which affects shellfish).

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the seaward undercurrent created after waves have broken on the shore