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English definition of “set in”

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set in

verb uk phrasal verb with set   /set/ ( present participle setting, past tense and past participle set) us  
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.
(Definition of set in from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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