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English definition of “let on”

let on

informal phrasal verb with let     /let/ verb (present participle letting, past tense and past participle let)
to tell other people about something that you know , especially when it is a secret : I suspect he knows more than he's letting on.Revealing secrets and becoming known
(Definition of let on from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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