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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]

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Nearby words

up close and personal, up for grabs, up front, up in arms, up in the air, up on something, be, up one's alley, up one's sleeve, up quark, up the creek, up the river

The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.