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English definition of “set sb off”

set sb off

informal phrasal verb with set     /set/ verb (present participle setting, past tense and past participle set)
to cause someone to start doing something: [+ -ing verb] Every time I think about it, it sets me off laugh ing . She's finally stopped crying - now don't set her off again.Starting and beginningStarting again
(Definition of set sb off from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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