Wiktionary
Etymology 1 alt. 1 A dangerous seaward current: 2 # 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. 3 # A dangerous longshore current; a rip current caused by return flow.'''', U.S. Army Coastal Engineering Research Center, Volume III (1975, Department of the Army Corps of Engineers) 4 A channel through which a seaward current flows: 5 # 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). 6 # The submerged channel or inlet through a bar caused (naturally) by a longshore rip current. n. 1 A dangerous seaward current: 2 # 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. 3 # A dangerous longshore current; a rip current caused by return flow.'''', U.S. Army Coastal Engineering Research Center, Volume III (1975, Department of the Army Corps of Engineers) 4 A channel through which a seaward current flows: 5 # 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). 6 # The submerged channel or inlet through a bar caused (naturally) by a longshore rip current. Etymology 2
n. (alternative form of sea-purse English)