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.
See also: know

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