shutoff

[shuht-awf, -of]
noun
1.
an object or device that shuts (something) off: the automatic shutoff on a heater.
2.
an act or instance of shutting off something, as an opening, a flow, or a service: a shutoff of electric power due to unpaid bills.
Also, shut-off.


Origin:
1865–70; noun use of verb phrase shut off

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Use low-flow drip-irrigation with a manual shutoff valve for the first year or
  so, until plants are established.
When food is full of nutrition our bodies have an automatic shutoff to eating
  too much.
BP says today that it still hopes to install a shutoff valve on one of them,
  but that's not an option for the others.
Finally the vehicle was in park and engine was shutoff by turning the key to
  the off position.
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