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English definition of “go off”

go off

phrasal verb with go    /ɡoʊ/ verb (present tense goes, present participle going, past tense went  /went/, past participle gone  /ɡɔn, ɡɑn/)
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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