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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)
When something unpleasant sets in, it begins and seems likely to continue in a serious way: This rain looks as if it has set in for the rest of the day . If you get bitten by a dog , you have to make sure the wound is properly cleaned , or an infection could set in. Despair seems to have set in among the team .Starting and beginningStarting again
(Definition of set in from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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