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English definition of “go off”

go off

(NOISE) phrasal verb with go     /ɡəʊ/ US  /ɡoʊ/ verb (present participle going, past tense went, past participle gone)
B2 If a warning device goes off, it starts to ring loudly or make a loud noise: The alarm should go off automatically as soon as smoke is detected. Didn't you hear your alarm clock going off this morning?Sounds made by objects, movement or impact
(Definition of go off (NOISE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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