1. a device or valve that stops the flow of a liquid, gas, or electricity
2. the act of stopping or cutting off a supply or service

Examples

• The water shutoff valve is located near the street.
• We need to find the gas shutoff before doing any repairs.
• The power company announced a shutoff for maintenance work.
• There’s an emergency shutoff switch on the machine.
• The utility threatened a shutoff if the bill wasn’t paid.
• Make sure you know where the main shutoff is located.
• The automatic shutoff prevents overheating.