Chapter Shanker to Sharp of S by Webster's Dictionary (1913 Edition)

1. To sharpen. [Obs.] Spenser.

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.

Sharp
(Sharp), v. i.

1. To play tricks in bargaining; to act the sharper. L'Estrange.

2. (Mus.) To sing above the proper pitch.