What is Turn off ?
Turn off is (verb) 1. to switch off Don’t forget to turn the TV off when you go to bed. Turn off the lights or turn the lights off father’s going to show his holiday films. 2. to leave a road you are travelling on You can turn off the High Street into one of the car parks. When you get to the next crossroads turn off the main road and go down a little path towards the river.
source: Easier English, Student Dictionary Upper Intermediate Level