Definition from macmillandictionary.com
The gun went off while he was cleaning it.
All the lights in the building suddenly went off.
I went off the idea of buying a sports car after I found out how much it would cost.
Dave’s gone off to the south of France for the summer.
He went off to have lunch in the canteen at one o’clock.
I was just lying in bed waiting for the alarm to go off.
His work has really gone off recently.
The whole conference went off just as we had planned.
The baby’s just gone off to sleep.
He just went off on her for no apparent reason.