noun
a valve or faucet used to control the flow of water on a boat or ship
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The sea cock on the ship needed to be inspected regularly to ensure it was functioning properly.
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Make sure to check the sea cock before setting sail to avoid any issues out at sea.
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I wouldn't trust that old sea cock, better to replace it with a new one.
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His ability to navigate rough waters was like a well-oiled sea cock, always reliable in times of trouble.