be in the know

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be in the know

slang To be well-informed, especially about a topic that is not widely known. Paige is in the know, so if she says that's the best restaurant in town, we definitely have to go there. Ask Carrie who's going to get the promotion—she's on the executive board, so she's in the know about a lot of things.
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be in the know

COMMON If you are in the know about something, especially something that is not known about or understood by many people, you have information about it. These deaths especially affected poor women, since the better off had their babies at home. Those in the know tried to keep out of hospital. Anyone in the know about what had really taken place would have realised immediately that this was dangerous.
See also: know

be in the know

be aware of something known only to a few people.
See also: know
References in classic literature ?
there stood a strong man, with a mighty hamper, which, being hauled into the room and presently unpacked, disgorged such treasures as tea, and coffee, and wine, and rusks, and oranges, and grapes, and fowls ready trussed for boiling, and calves'-foot jelly, and arrow-root, and sago, and other delicate restoratives, that the small servant, who had never thought it possible that such things could be, except in shops, stood rooted to the spot in her one shoe, with her mouth and eyes watering in unison, and her power of speech quite gone.