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English definition of “let on”

let on

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