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English definition of “set sth off”

set sth off

phrasal verb with set
 
 
/set/ verb (present participle setting, past tense and past participle set)
to make something begin or happen, especially a loud noise or a lot of activity: He's always burning the toast and setting off the smoke alarm.Causing things to happen
(Definition of set sth off from the Cambridge Learners Dictionary © Cambridge University Press)
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