What is the meaning of Turn_off?

To dismiss; to fire.

To power down, to switch off, to put out of operation, to deactivate (an appliance, light, mechanism, functionality etc.).

To become deactivated; to become powered down.

To rotate a tap or valve so as to interrupt the outflow of liquid or gas.

To repulse, disgust, or discourage (someone).

To leave a road; to exit.

Source: wiktionary.org