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