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to let on
[phrase form: let]
01
漏らす（もらす）, 明かす（あかす）
to reveal information that was meant to be kept a secret
Example
He let on that he knew about the promotion before anyone else.
They promised not to let on about the proposal, but someone leaked the details.
Do n’t let on that you saw me, I do n’t want anyone to know I ’m here.
