(1):
(a.) To make more pungent and intense; as, to sharpen a pain or disease.
(2):
(a.) To make sharp.
(3):
(a.) To give a keen edge or fine point to; to make sharper; as, to sharpen an ax, or the teeth of a saw.
(4):
(a.) To render more quick or acute in perception; to make more ready or ingenious.
(5):
(a.) To make more eager; as, to sharpen men's desires.
(6):
(a.) To make biting, sarcastic, or severe.
(7):
(a.) To render more shrill or piercing.
(8):
(a.) To make more tart or acid; to make sour; as, the rays of the sun sharpen vinegar.
(9):
(a.) To raise, as a sound, by means of a sharp; to apply a sharp to.
(10):
(v. i.) To grow or become sharp.