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Adverb: upside down  'úp,sId'dawn
  1. In an inverted manner
    "the box was lying on the floor upside down"
Adjective: upside-down  'úp,sId'dawn
  1. Being in such a position that top and bottom are reversed
    "an upside-down cake";
    - inverted

See also: turned

Encyclopedia: Upside down