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.