The bomb went off unexpectedly in the middle of the night.
To make a sudden loud noise, especially as a warning or signal. The alarm went off at 6 AM, waking everyone in the house.
To stop functioning or cease operation. The lights went off during the storm, leaving us in darkness.
To become spoiled or rotten. The milk went off because it was left out of the fridge for too long.
To leave a place, especially for a particular purpose. She went off to college in another state.
To happen or occur, especially in a particular way. The party went off without a hitch, and everyone had a great time.
To become angry or start behaving in an uncontrolled way. He went off on his colleague during the meeting.