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English definition of “let sb in on sth”

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let sb in on sth

verb uk phrasal verb with let   /let/ ( present participle letting, past tense and past participle let) us  
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 Learners Dictionary & Thesaurus © Cambridge University Press)
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