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to let on
[phrase form: let]
01
to reveal information that was meant to be kept a secret
Example
The traveler let on about their hidden stash of valuables to a fellow passenger, inadvertently making themselves a target for theft.
The child let on about their parents’ secret plans to their friends, causing a stir of excitement and anticipation.
The surprise party planner accidentally let on about the event to the guest of honor, ruining the surprise.
The undercover agent let on about their true identity to a suspicious individual, jeopardizing their mission.
Even after the long discussion, he remained noncommittal, not letting on what he truly thought.