Stopcock
/ˈstɑːpkɑːk/
Definition 1 of 1
Pro Tip 1/3Plumbing Situations
Stopcock is commonly used when discussing plumbing to control water flow. 
The plumber instructed me to find the main stopcock to stop the leak.
Pro Tip 2/3Emergency Use
Knowing how to operate a stopcock is crucial in emergencies to prevent water damage. 
During the flood, we turned off the stopcock to avoid more water coming in.
Pro Tip 3/3Technical Context
The word is mostly used in technical or mechanical contexts, not in everyday conversation. 
The technician checked the stopcock to ensure the system was not leaking.
Compare with
CockFaucetSpigotTapValve
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