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Meaning of shutoff

shut•off

Pronunciation: (shut'ôf", -of"), [key]
— n.
  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.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.