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4 definitions found
 for sharpen
From The Collaborative International Dictionary of English v.0.48 :

  Sharpen \Sharp"en\, v. t. [imp. & p. p. Sarpened; p. pr. & vb.
     n. Sharpening.] [See Sharp, a.]
     To make sharp. Specifically:
     (a) To give a keen edge or fine point to; to make sharper;
         as, to sharpen an ax, or the teeth of a saw.
     (b) To render more quick or acute in perception; to make more
         ready or ingenious.
         [1913 Webster]
               The air . . . sharpened his visual ray
               To objects distant far.              --Milton.
         [1913 Webster]
               He that wrestles with us strengthens our nerves and
               sharpens our skill.                  --Burke.
         [1913 Webster]
     (c) To make more eager; as, to sharpen men's desires.
         [1913 Webster]
               Epicurean cooks
               Sharpen with cloyless sauce his appetite. --Shak.
         [1913 Webster]
     (d) To make more pungent and intense; as, to sharpen a pain
         or disease.
     (e) To make biting, sarcastic, or severe. "Sharpen each
         word." --E. Smith.
     (f) To render more shrill or piercing.
         [1913 Webster]
               Inclosures not only preserve sound, but increase
               and sharpen it.                      --Bacon.
         [1913 Webster]
     (g) To make more tart or acid; to make sour; as, the rays of
         the sun sharpen vinegar.
     (h) (Mus.) To raise, as a sound, by means of a sharp; to
         apply a sharp to.
         [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Sharpen \Sharp"en\, v. i.
     To grow or become sharp.
     [1913 Webster]

From WordNet (r) 3.0 (2006) :

      v 1: make sharp or sharper; "sharpen the knives" [ant: blunt,
      2: make crisp or more crisp and precise; "We had to sharpen our
      3: become sharp or sharper; "The debate sharpened"
      4: put (an image) into focus; "Please focus the image; we cannot
         enjoy the movie" [syn: focus, focalize, focalise,
         sharpen] [ant: blear, blur]
      5: make (images or sounds) sharp or sharper [ant: soften]
      6: raise the pitch of (musical notes) [ant: drop, flatten]
      7: give a point to; "The candles are tapered" [syn: sharpen,
         taper, point]
      8: make (one's senses) more acute; "This drug will sharpen your
         vision" [syn: sharpen, heighten]

From Moby Thesaurus II by Grady Ward, 1.0 :

  94 Moby Thesaurus words for "sharpen":
     accelerate, aculeate, acuminate, agent provocateur, aggravate,
     amplify, animate, annoy, augment, barb, beef up, blow up, build up,
     complicate, concentrate, condense, consolidate, cultivate,
     cuspidate, deepen, deteriorate, double, dress, edge, embitter,
     enhance, enlarge, enliven, exacerbate, exaggerate, exasperate,
     excite, exhilarate, file, fillip, galvanize, grind, heat up,
     heighten, hone, hop up, hot up, increase, infuse life into,
     instrument, intensify, invigorate, irritate, jazz up, key up,
     machine, magnify, make acute, make complex, make sensitive,
     make worse, mechanize, mill, motorize, oilstone, pick up, pique,
     point, provoke, quicken, ramify, redouble, refine, reinforce,
     renew, reset, resuscitate, retool, revive, sensibilize, sensitize,
     set, sharp, soup up, sour, spiculate, spur, step up, stimulate,
     stir, strap, strengthen, stroke, strop, taper, tool, triple, whet,

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