to tell someone a secret
But if I'm let in on this letter stuff, well, obviously it's privileged info which I can't talk about.
If the public has to be let in on what we're doing, we're constructing a feminine robot with intuition.
If you promise not to tell, I’ll let you in on a secret.
They were planning something, but they wouldn’t let me in on it.
lets in on
letting in on
There is no origin for this phrasal verb
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