in on

listen to the pronunciation of in on
English - English
Part of or privy to (something private, especially a plan or plot)

We had to let him in on it after he overheard some of us talking.

having knowledge about or involvement in something

The whole class was in on the plans for the surprise party.

participating in or knowledgeable out; "was in on the scheme"
be in on
To be a party to a secret shared by a small group of people

He smiled a little to himself, as he was in on the plan.

in on
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