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English definition of “upright”

upright

adjective uk   /ˈʌp.raɪt/ us  

upright adjective (STRAIGHT)

B2 straight up or vertical: Please return your seat to an upright position and fasten your belt. describes something that is taller than it is wide: an upright freezer/vacuum cleaner

upright adjective (MORAL)

approving honest, responsible, and moral: She behaved as any upright citizen would have under the circumstances.

upright

adverb uk   /ˈʌp.raɪt/ us  
B2 vertical and as straight as possible: to sit/stand upright The sound of breaking glass made her sit bolt upright (= sit with her back straight).

upright

noun [C] uk   /ˈʌp.raɪt/ us  
a vertical part of something that supports other parts: Firmly secure the two uprights to opposite walls in the alcove and then slot the shelves in between them. UK informal for goalpost (also upright piano) a piano in which the strings are vertical
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(Definition of upright from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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