v. 1. To stop by turning a knob or handle or by working a switch; to cause to be off. He turned the water off. He turned off the light. 2. To leave by turning right or left onto another way. Turn off the highway at exit 5. The car turned off on Bridge Street. 3. slang To disgust, bore, or repel (someone) by being intellectually, emotionally, socially, or sexually unattractive. I won't date Linda Bell anymore she just turns me off.
Antonym: TURN ON.