Meaning of “set in” in the English Dictionary

british dictionary

"set in" in British English

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set in

phrasal verb with set uk /set/ us /set/ verb present participle setting, past tense and past participle set

(Definition of “set in” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"set in" in American English

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set in

phrasal verb with set us /set/ verb

to begin:

If the wound is untreated, infection may set in.
In winter, darkness sets in so early!
Note: said about conditions or situations that last for a period of time

(Definition of “set in” from the Cambridge Academic Content Dictionary © Cambridge University Press)