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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)
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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).
(noun)
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