Source : Webster's Revised Unabridged Dictionary (1913)

Sharp \Sharp\, v. i.
   1. To play tricks in bargaining; to act the sharper.
      --L'Estrange.

   2. (Mus.) To sing above the proper pitch.

Sharp \Sharp\, a. [Compar. {Sharper}; superl. {Sharpest}.] [OE.
   sharp, scharp, scarp, AS. scearp; akin to OS. skarp, LG.
   scharp, D. scherp, G. scharf, Dan. & Sw. skarp, Icel. skarpr.
   Cf. {Escarp}, {Scrape}, {Scorpion}.]
   1. Having a very thin edge or fine point; of a nature to cut
      or pierce easily; not blunt or dull; keen.

            He dies upon my scimeter's sharp point. --Shak.

   2. Terminating in a point or edge; not obtuse or rounded;
      somewhat pointed or edged; peaked or ridged; as, a sharp
      hill; sharp features.

   3. Affecting the sense as if pointed or cutting, keen,
      penetrating, acute: to the taste or smell, pungent, acid,
      sour, as ammonia has a sharp taste and odor; to the
      hearing, piercing, shrill, as a sharp sound or voice; to
      the eye, instantaneously brilliant, dazzling, as a sharp
      flash.

   4. (Mus.)
      (a) High in pitch; acute; as, a sharp note or tone.
      (b) Raised a semitone in pitch; as, C sharp (C[sharp]),
          which is a half step, or semitone, higher than C.
      (c) So high as to be out of tune, or above true pitch; as,
          the tone is sharp; that instrument is sharp. Opposed
          in all these senses to {flat}.

   5. Very trying to the feelings; piercing; keen; severe;
      painful; distressing; as, sharp pain, weather; a sharp and
      frosty air.

            Sharp misery had worn him to the bones. --Shak.

            The morning sharp and clear.          --Cowper.

            In sharpest perils faithful proved.   --Keble.

   6. Cutting in language or import; biting; sarcastic; cruel;
      harsh; rigorous; severe; as, a sharp rebuke. ``That sharp
      look.'' --Tennyson.

            To that place the sharp Athenian law Can not pursue
            us.                                   --Shak.

            Be thy words severe, Sharp as merits but the sword
            forbear.                              --Dryden.

   7. Of keen perception; quick to discern or distinguish;
      having nice discrimination; acute; penetrating; sagacious;
      clever; as, a sharp eye; sharp sight, hearing, or
      judgment.

            Nothing makes men sharper . . . than want.
                                                  --Addison.

            Many other things belong to the material world,
            wherein the sharpest philosophers have never ye?
            arrived at clear and distinct ideas.  --L. Watts.

   8. Eager in pursuit; keen in quest; impatient for
      gratification; keen; as, a sharp appetite.

   9. Fierce; ardent; fiery; violent; impetuous. ``In sharp
      contest of battle.'' --Milton.

            A sharp assault already is begun.     --Dryden.

   10. Keenly or unduly attentive to one's own interest; close
       and exact in dealing; shrewd; as, a sharp dealer; a sharp
       customer.

             The necessity of being so sharp and exacting.
                                                  --Swift.

   11. Composed of hard, angular grains; gritty; as, sharp sand.
       --Moxon.

   12. Steep; precipitous; abrupt; as, a sharp ascent or
       descent; a sharp turn or curve.

   13. (Phonetics) Uttered in a whisper, or with the breath
       alone, without voice, as certain consonants, such as p,
       k, t, f; surd; nonvocal; aspirated.

   Note: Sharp is often used in the formation of self-explaining
         compounds; as, sharp-cornered, sharp-edged,
         sharp-pointed, sharp-tasted, sharp-visaged, etc.

   {Sharp practice}, the getting of an advantage, or the attempt
      to do so, by a tricky expedient.

   {To brace sharp}, or {To sharp up} (Naut.), to turn the yards
      to the most oblique position possible, that the ship may
      lie well up to the wind.

   Syn: Keen; acute; piercing; penetrating; quick; sagacious;
        discerning; shrewd; witty; ingenious; sour; acid; tart;
        pungent; acrid; severe; poignant; biting; acrimonious;
        sarcastic; cutting; bitter; painful; afflictive;
        violent; harsh; fierce; ardent; fiery.

Sharp \Sharp\, adv.
   1. To a point or edge; piercingly; eagerly; sharply. --M.
      Arnold.

            The head [of a spear] full sharp yground. --Chaucer.

            You bite so sharp at reasons.         --Shak.

   2. Precisely; exactly; as, we shall start at ten o'clock
      sharp. [Colloq.]

   {Look sharp}, attend; be alert. [Colloq.]

Sharp \Sharp\, n.
   1. A sharp tool or weapon. [Obs.]

            If butchers had but the manners to go to sharps,
            gentlemen would be contented with a rubber at cuffs.
                                                  --Collier.

   2. (Mus.)
      (a) The character [[sharp]] used to indicate that the note
          before which it is placed is to be raised a half step,
          or semitone, in pitch.
      (b) A sharp tone or note. --Shak.

   3. A portion of a stream where the water runs very rapidly.
      [Prov. Eng.] --C. Kingsley.

   4. A sewing needle having a very slender point; a needle of
      the most pointed of the three grades, blunts, betweens,
      and sharps.

   5. pl. Same as {Middlings}, 1.

   6. An expert. [Slang]

Sharp \Sharp\, v. t. [imp. & p. p. {Sharped}; p. pr. & vb. n.
   {Sharping}.]
   1. To sharpen. [Obs.] --Spenser.

   2. (Mus.) To raise above the proper pitch; to elevate the
      tone of; especially, to raise a half step, or semitone,
      above the natural tone.

Source : WordNet®

sharp
     adj 1: (of something seen or heard) clearly defined; "a sharp
            photographic image"; "the sharp crack of a twig"; "the
            crisp snap of dry leaves underfoot" [syn: {crisp}]
     2: ending in a sharp point [syn: {acuate}, {acute}, {needlelike}]
     3: having or demonstrating ability to recognize or draw fine
        distinctions; "an acute observer of politics and
        politicians"; "incisive comments"; "icy knifelike
        reasoning"; "as sharp and incisive as the stroke of a
        fang"; "penetrating insight"; "frequent penetrative
        observations" [syn: {acute}, {discriminating}, {incisive},
         {keen}, {knifelike}, {penetrating}, {penetrative}, {piercing}]
     4: marked by practical hardheaded intelligence; "a smart
        businessman"; "an astute tenant always reads the small
        print in a lease"; "he was too shrewd to go along with
        them on a road that could lead only to their overthrow"
        [syn: {astute}, {shrewd}]
     5: harsh; "sharp criticism"; "a sharp-worded exchange"; "a tart
        remark" [syn: {sharp-worded}, {tart}]
     6: high-pitched and sharp; "piercing screams"; "a shrill
        whistle" [syn: {piercing}, {shrill}]
     7: extremely steep; "an abrupt canyon"; "the precipitous rapids
        of the upper river"; "the precipitous hills of Chinese
        paintings"; "a sharp drop" [syn: {abrupt}, {precipitous}]
     8: keenly and painfully felt; as if caused by a sharp edge or
        point; "a sharp pain"; "sharp winds" [ant: {dull}]
     9: very penetrating and clear and sharp in operation; "an
        incisive mind"; "a keen intelligence"; "of sharp and
        active intellect" [syn: {incisive}, {keen}]
     10: having or made by a thin edge or sharp point; suitable for
         cutting or piercing; "a sharp knife"; "a pencil with a
         sharp point" [ant: {dull}]
     11: sour or bitter in taste [syn: {acerb}, {acerbic}, {astringent}]
     12: raised in pitch by one chromatic semitone; "C sharp" [ant: {flat},
          {natural}]
     13: very sudden and in great amount or degree; "a sharp drop in
         the stock market"
     14: quick and forceful; "a sharp blow"

sharp
     n 1: a musical notation indicating one half step higher than the
          note named
     2: a long thin sewing needle with a sharp point

sharp
     adv : changing suddenly in direction and degree; "the road twists
           sharply after the light"; "turn sharp left here" [syn:
           {sharply}]

Source : Free On-Line Dictionary of Computing

sharp
     
         {hash}.