shut off phrasal verb ( see also ↑ shut )
1 . if a machine, tool etc shuts off or if you shut it off, it stops operating SYN turn off :
The iron shuts off automatically if it gets too hot.
shut something ↔ off
I let the engine run for a minute and then shut it off.
Don’t forget to shut off the water supply.
2 . shut something ↔ off to prevent goods or supplies from being available or being delivered:
a strike that closed the mines and shut off coal supplies
3 . shut yourself off to avoid meeting and talking to other people
shut yourself off from
He was cold and remote, shutting himself off from her completely.
4 . be shut off from somebody/something to be separated from other people or things, especially so that you are not influenced by them:
The valley is shut off from the modern world.