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shut (someone or oneself) off
To isolate someone or oneself from others. I'm worried about Jim—he's been shutting himself off lately. The other directors shut him off from the board meetings as a result of his inflammatory remarks.
shut (something) off
To force something closed or to stop operating. You can use my computer, just shut it off when you're done. We'll have to shut off the water main to repair the pipes.
To turn off or stop operating. The phone shuts off after a few moments of inactivity to save its battery. The generator has a sensor so that it will shut off by itself if it begins to overheat.
1. Stop the flow or passage of, as in They shut off the water while repairs were being made. [Early 1800s]
2. Close off, isolate, as in Loners shut themselves off from the community. [First half of 1800s]
1. To stop the flow, passage, or operation of something: The plumber shut off the water by closing a valve. Shut the lights off before you leave.
2. To stop flowing or operating, especially automatically: The electricity shuts off at midnight.
3. To isolate someone or something: The miser shut himself off from the community.