Available Definitions:
1) a. - To make sharp.
2) a. - To give a keen edge or fine point to; to make sharper; as, to sharpen an ax, or the teeth of a saw.
3) a. - To render more quick or acute in perception; to make more ready or ingenious.
4) a. - To make more eager; as, to sharpen men's desires.
5) a. - To make more pungent and intense; as, to sharpen a pain or disease.
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.