verb
to stop the flow or operation of something
adjective
used to describe something that has been turned off or stopped
adverb
in a manner that stops the flow or operation of something
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Please remember to shut off all electronic devices before takeoff.
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Don't forget to shut off the lights when you leave the room.
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I had to shut off the TV because it was getting on my nerves.
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Sometimes we need to shut off our emotions in order to make rational decisions.