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

  (informal)
to know about something which most people do not know about The resort is considered by those who are in the know to have the best downhill skiing in Europe.
See also: know