To go off is to explode or to sound — or, of food, to spoil. Three senses with nothing in common.
The explosion sense covers bombs, guns, alarms and fireworks, so a car alarm that goes off at three in the morning is the commonest experience of it. The food sense is British and very common, since milk goes off. There are more: going off somebody means losing your liking for them, and going off on somebody is an American phrase for losing your temper.
Practised in Phrasal Verbs, A Man Called Ove
First appears in chapter 4 of A Man Called Ove.
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