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to shut off
01
stem the flow of
02
to stop or close off the flow or passage of something
03
isolate or separate
Example
They shut off access to the building during the security drill.
The mechanic shut off the engine to inspect the problem.
She shut off the electricity before changing the light bulb.
The city shut off traffic to clear the accident on the highway.
When the motor overheated, the relay shut off the power to prevent damage.