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Definition of sharpen:

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

Synonyms:

place, whet, channelize, strengthen, grind, rivet, manoeuver, correct, reinforce, chisel, rise, concentre, indicate, guide, chip away, strop, flail, enrich, pore, card, focalize, chop, concentrate, stone, bespeak, compound, stiffen, point, toughen, enhance, maneuver, harden, designate, sharp, improve, focus, repoint, level, channelise, acuminate, centre, obscure, cloud, chase, confuse, file, revitalize, head, drill, focalise, orient, bolster, signal, invigorate, raise, direct, luff, taper, center, optimization, localise, flatten, betoken, lift, charge, concenter, aim, steer, crimp, localize, cut, show, target, thicken, remedy, boost, improve on, clarify, manoeuvre.

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