Sharpen word meaning and definition

[verb] put into focus; as of an image on a screen; "Please focus the image; we cannot enjoy the movie"
[verb] become sharp or sharper; "The debate sharpened"
[verb] make sharp or sharper; "We had to sharpen our arguments"
[verb] make more acute; as of one's senses; "This drug will sharpen your vision"
[verb] give a point to; "The candles are tapered"
[verb] raise the pitch of (musical notes)
[verb] make sharp or sharper; "sharpen the knives"
[verb] make sharp or sharper of images and sounds

\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. The air . . . sharpened his visual ray To objects distant far. --Milton. He that wrestles with us strengthens our nerves and sharpens our skill. --Burke.
(c) To make more eager; as, to sharpen men's desires. Epicurean cooks Sharpen with cloyless sauce his appetite. --Shak.
(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. Inclosures not only preserve sound, but increase and sharpen it. --Bacon.
(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.
\Sharp"en\, v. i. To grow or become sharp.

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