I turn off, I switch off, I put out, I extinguish
Do you mind if I turn off the light?
Es la primera vez que apago el calefactor en invierno.
This is the first time I've turned off the heater in winter.
Es la primera vez que apago un cigarrillo antes de terminarlo.
It’s the first time I’ve put out a cigarette before finishing it.
¿No te molesta si apago el aire acondicionado?
Do you mind if I turn off the air conditioning?