In On
Synonyms: Privy to, acquainted with, advised of, mindful of, wise to, up on, hip to, ware of, aware of, informed about/of, apprised of, sensible of, clued in on, in the know about, and in the loop.
Example Sentences
She was in on the surprise.
Are you in on the secret?
He was in on the plan from the start.
They kept her in on all decisions.