'Upsidown' definitions:
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Upsidown \Up"si*down`\, adv.
See Upsodown. [Obs. or Colloq.] --Spenser.
[1913 Webster]
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Upside down \Up"side down`\, adv.
in such a manner that the part normally pointed upward is
pointed downward; same as upsidown and upsodown.
[PJC]
