let on Meaning in the Cambridge English Dictionary
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Meaning of “let on” in the English Dictionary

"let on" in British English

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let on

informal
phrasal verb with let uk   us   /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.
(Definition of let on from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"let on" in American English

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let on

phrasal verb with let  us   /let/ verb [T]
to ​tell other ​people about something that you ​know, esp. when it is a ​secret: If he did ​know the ​truth, he didn’t let on.
(Definition of let on from the Cambridge Academic Content Dictionary © Cambridge University Press)
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