Definition of upright adjective from the Oxford Advanced American Dictionary

     

    upright

     adjective
    adjective
    NAmE//ˈʌpraɪt//
     
     
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  1. 1 (of a person) not lying down, and with the back straight rather than bent an upright posture Gradually raise your body into an upright position.
  2. 2 placed in a vertical position Keep the bottle upright. an upright freezer (= one that is taller than it is wide) an upright piano (= one with vertical strings) an upright vacuum cleaner (= one designed to be used in a vertical position)
  3. 3(of a person) behaving in a moral and honest way synonym upstanding an upright citizen
  4. Idioms
    sit/stand bolt upright
     
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    to sit or stand with your back straight
See the Oxford Advanced Learner's Dictionary entry: upright