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.

Supercharge \Su`per*charge"\, n. (Her.)
   A bearing charged upon another bearing. [R.]

Source : WordNet®

supercharge
     v 1: increase or raise; "boost the voltage in an electrical
          circuit" [syn: {boost}, {advance}]
     2: increase the pressure on a gas or liquid [syn: {pressurize},
         {pressurise}]