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up on (something)
Very familiar with or knowledgeable about something. Sorry, I'm not up on archaeology. You should ask Professor Layton. My parents are up on all sorts of cool new music, much to the surprise of my friends. Make sure you stay up on the policy changes that will be implemented throughout the year.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
up on someone or something
Fig. knowledgeable about someone or something. Ask Tom about the author of this book. He's up on stuff like that.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.