in the know
in the know {adj. phr.}, {informal}
Knowing about things that most people do not know about; knowing secrets or understanding a special subject.
Tina helped Professor Smith make some of the exam questions, and she felt important to be in the know.
In a print shop, Mr. Harvey is in the know, but in a kitchen he can't even cook an egg.
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Source: A Dictionary of American Idioms
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