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