Definition of be (well) up on (or in) in US English:

be (well) up on (or in)

phrase

  • Well informed about.

    ‘he was up on the latest methods’
    • ‘However, you two don't seem to be up on current events.’
    • ‘She wanted to be be up on any news sent to them.’
    • ‘Even officials who would presumably be up on such issues appeared fuzzy about the central questions.’
    • ‘Anyway, you seem to be up on physics, and you seem to know what I'm saying so maybe you could help me here.’
    • ‘When I went out there last year people really seemed to be up on racing.’
    • ‘In this day of endless theory, top players need to be up on all important games if they are to have any hope of success.’
    well versed in, well informed about, conversant with, knowledgeable about, informed about, abreast of, apprised of, up to date on, au courant with
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