Meaning of “let sb in on sth” in the English Dictionary

british dictionary

"let sb in on sth" in British English

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let sb in on sth

phrasal verb with let uk /let/ us /let/ verb present participle letting, past tense and past participle let

to tell someone about something that is secret, or to allow someone to become involved in something that only very few people are involved in:

Debbie agreed to let me in on her plans.

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