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English definition of “set sth off”

set sth off

(CAUSE) phrasal verb with set     /set/ verb (present participle setting, past tense and past participle set)
C2 to cause an activity or event , often a series of events , to begin or happen : The court's initial verdict in the police officers ' trial set off serious riots .Starting and beginningStarting again to cause a loud noise or explosion , such as that made by a bomb or an alarm (= a warning sound ) to begin or happen : Terrorists set off a bomb in the city centre . Somebody set the alarm off on my car .Exploding and erupting
(Definition of set sth off (CAUSE) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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