let sb in on sth

— phrasal verb with let

/let/ verb (present tense letting, past tense and past participle let)

Definition

› 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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