What is the meaning of Turn_off?

Used other than figuratively or idiomatically: see turn,‎ off.

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

To deactivate a heat source cooking a particular item.

To become deactivated; to become powered down.

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

To dismiss; to fire.

To bore, repulse, disgust, or discourage (someone).

To leave a road; to exit a highway or other main road.

To avert; to stop (something).

To turn out; to produce.

To execute by hanging.

To raise, unblocking the way and signaling that a train may proceed.

Source: wiktionary.org