be up on

be up on (something)

To have the most current knowledge about a particular subject or issue; to be up to date on (something). Make sure you're up on this account before our meeting tomorrow morning. I'm not too up on the policy changes happening this year—is there a reference guide I can consult?
See also: on, up
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

be up on

be well informed about a matter or subject.
See also: on, up
Farlex Partner Idioms Dictionary © Farlex 2017
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