be clued in

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be clued in

To be familiar with or aware of the particulars of a situation, especially through inference, previous knowledge, or by being privy to inside information. Usually followed by "on," "to," or "about." By the end of the week, everyone was clued in on the reason for the professor's sudden absence from class. You need to be clued in to the way people behave in social situations!
See also: clue