up on something, be
Be well informed or up-to-date about something, as in I'm not up on the latest models of cars. [Colloquial]
Words Nearby up on something, be
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
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