DuckCorp Dico

Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   Sharp \Sharp\, v. t. [imp. & p. p. Sharped; p. pr. & vb. n.
      Sharping.]
      1. To sharpen. [Obs.] --Spenser.
         [1913 Webster]
      2. (Mus.) To raise above the proper pitch; to elevate the
         tone of; especially, to raise a half step, or semitone,
         above the natural tone.
         [1913 Webster]