shutoff

/ˈʃʌtˌɔf/
noun
  1. A device or valve that stops the flow of something, such as water, gas, or electricity.
    • Turn the shutoff valve under the sink before fixing the pipe.
    • He installed a shutoff switch for the outdoor lights.
    • The emergency shutoff for the gas line is located outside the house.
  2. An act of stopping the supply or operation of something.
    • The power shutoff was scheduled for maintenance.
    • A sudden shutoff of funding caused the project to halt.
    • The water shutoff lasted for three hours while repairs were made.
adjective
  1. Relating to a device or mechanism that stops operation or flow.
    • Make sure the shutoff switch is in the off position.
    • The shutoff valve is clearly marked with a red handle.
    • The shutoff timer turns the engine off automatically.