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English definition of “let sb in on sth”

let sb in on sth

phrasal verb with let     /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.Revealing secrets and becoming known
(Definition of let sb in on sth from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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