Sharpen

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