Definition of up adjective from the Oxford Advanced Learner's Dictionary



    BrE BrE//ʌp//
    ; NAmE NAmE//ʌp//
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  1. 1[only before noun] directed or moving upwards an up stroke the up escalator
  2. 2[not before noun] (informal) cheerful; happy or excited The mood here is resolutely up. See related entries: Excitement
  3. 3[not before noun] (of a computer system) working Our system should be up by this afternoon.
  4. Word OriginOld English up(p), uppe, of Germanic origin; related to Dutch op and German auf.
See the Oxford Advanced American Dictionary entry: up