Webster's Revised Unabridged Dictionary · 1913

Sharp

Sharp , adjective

[Old English sharp, scharp, scarp, Anglo-Saxon scearp; akin to Old Saxon skarp, LG. scharp, Dutch scherp, German scharf, Danish & Swedish skarp, Icelandic skarpr. Compare 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. — Shakespeare
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.
(a) (Music) High in pitch; acute; as, a sharp note or tone.
(b)
(Music) Raised a semitone in pitch; as, C sharp (C♯), which is a half step, or semitone, higher than C.
(c)
(Music) 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. — Shakespeare
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. — Shakespeare
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{not transcribed} 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.

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

Collocations (2)
Sharp practice , the getting of an advantage, or the attempt to do so, by a tricky expedient.
To brace sharp or To sharp up (Nautical) , to turn the yards to the most oblique position possible, that the ship may lie well up to the wind.

Sharp , adverb

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. — Shakespeare
2.
Precisely; exactly; as, we shall start at ten o'clock sharp. [Colloquial]
Collocations (1)
Look sharp , attend; be alert. [Colloquial]

Sharp , noun

1.
A sharp tool or weapon. [Obsolete]
If butchers had but the manners to go to sharps, gentlemen would be contented with a rubber at cuffs. — Collier
2.
(a) (Music) The character [♯] used to indicate that the note before which it is placed is to be raised a half step, or semitone, in pitch.
(b)
(Music) A sharp tone or note. — Shakespeare
3.
A portion of a stream where the water runs very rapidly. [Provincial English] — 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.
Same as Middlings, 1.
6.
An expert. [Slang]

Sharp , transitive verb

1.
To sharpen. [Obsolete] — Spenser
2.
(Music) To raise above the proper pitch; to elevate the tone of; especially, to raise a half step, or semitone, above the natural tone.

Sharp , intransitive verb

1.
To play tricks in bargaining; to act the sharper. — L'Estrange
2.
(Music) To sing above the proper pitch.