stopcock
US /ˈstɑːp.kɑːk/
UK /ˈstɑːp.kɑːk/
1.
a valve that regulates the flow of fluid through a pipe, especially one controlling the flow of water to a building or appliance.
:
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The plumber turned off the main stopcock before starting the repair.
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Make sure to locate the stopcock in your home in case of a leak.