in on

adverb

participating in or knowledgeable out

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was in on the scheme

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PRIVY TO, aware of, acquainted with, informed about/of, apprised of; informal wise to, in the know about, hip to; archaic ware of.

→ in

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in on (informal)

1. Participating in

2. Privy to

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Main Entry: ↑in

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privy to (a secret)

they were in on the conspiracy

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in on

◇ If you are in on something you have knowledge about it or are involved in it.

They were all in on the scheme.

The characters are convinced that they're on another planet, but the audience is in on the joke. [=the audience knows they are not on another planet]

I let them in on our little secret. [=I told them our secret]

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Main Entry: ↑in