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English definition of “go off”

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go off

verb phrasal verb with go  /ɡoʊ/ ( present tense goes, present participle going, past tense went  /went/, past participle gone  /ɡɔn, ɡɑn/) us  
to explode, or to fire bullets: The deer ran away just before the hunter’s gun went off. If a special signal or an electronic device goes off, it warns people that there is danger or that something is wrong: What do they do if the metal detector goes off?
(Definition of go off from the Cambridge Academic Content Dictionary © Cambridge University Press)
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