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flap gate

noun
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Definition of flap gate

: a gate hinged at the top and opening one way only and placed in a channel to close automatically on reversal of flow — compare flap valve

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“Flap gate.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/flap%20gate. Accessed 29 January 2020.

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