Source : Webster's Revised Unabridged Dictionary (1913)

Uncrown \Un*crown"\, v. t. [1st pref. un- + crown.]
   To deprive of a crown; to take the crown from; hence, to
   discrown; to dethrone.

         He hath done me wrong, And therefore I'll uncrown him
         ere't be long.                           --Shak.