turn off

[H]e came to this country in the service of an English gentleman, whom he was obliged to quit through the malice of the valet de chambre, who taking advantage of the young man's being overtaken with liquor on the last St.Andrew's day, turned him off, on the pretext of his being an habitual drunkard.

Hello, IT. Have you tried turning it off and turning it on again? Ok. Well, are you sure that it's plugged in?

My computer turned off!

Remember to turn the tap off once you've finished so you don't waste water.

Cigarette smoking really turns me off.

Turn off at the next exit so we can have lunch.