shut off
phrasal verbshut off  
- (of a machine, tool, etc.) to stop working
- The engines shut off automatically in an emergency.
 
 
shut something  off 
- to stop a machine, tool, etc. from working
- I wish someone would shut off that car alarm.
 
 - to stop a supply of gas, water, etc. from flowing or reaching a place
- A valve immediately shuts off the gas when the lid is closed.