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English definition of “go off”

go off

verb uk phrasal verb with go   /ɡəʊ/ us    /ɡoʊ/ (present participle going, past tense went, past participle gone)

(STOP WORKING)

B1 If a light or a machine goes off, it stops working: The lights went off in several villages because of the storm.

(EXPLODE)

C1 If a bomb goes off, it explodes: The bomb went off at midday. C1 If a gun goes off, it fires: His gun went off accidentally.

(FOOD)

B2 UK If food or drink goes off, it is not good to eat or drink any more because it is too old: This bacon smells a bit funny - do you think it's gone off?
See also

(NOISE)

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?

(LEAVE)

B1 to leave a place and go somewhere else: She's gone off to the pub with Tony

(HAPPEN)

to happen in a particular way: The protest march went off peacefully.

(BECOME WORSE)

UK to become worse in quality: That paper's really gone off since they got that new editor.
(Definition of go off from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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