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English definition of “set in”

set in

phrasal verb with set     /set/ verb (present participle setting, past tense and past participle set)
If something unpleasant sets in, it begins and seems likely to continue : This rain looks as if it has set in for the rest of the day .Starting and beginningStarting again
(Definition of set in from the Cambridge Learner's Dictionary © Cambridge University Press)

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