Meaning of “let on” in the English Dictionary

british dictionary

"let on" in British English

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let on

informal
phrasal verb with let uk /let/ 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)