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tide gate

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noun
  1. a gate through which water flows when the tide is in one direction and that closes automatically when the tide is in the opposite direction.
  2. a restricted passage, as a strait, through which the tide flows swiftly.
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Origin of tide gate

First recorded in 1745–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018