Source : Webster's Revised Unabridged Dictionary (1913)

Supercharge \Su`per*charge"\, v. t. [imp. & p. p.
   {Supercharged}; p. pr. & vb. n. {Supercharging}.] [Pref.
   super- + charge. Cf. {Surcharge}.] (Her.)
   To charge (a bearing) upon another bearing; as, to
   supercharge a rose upon a fess.