from The American Heritage® Dictionary of the English Language, 4th Edition
- transitive v. To make or become sharp or sharper.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- v. To make sharp
from the GNU version of the Collaborative International Dictionary of English
- transitive v. To give a keen edge or fine point to; to make sharper.
- transitive v. To render more quick or acute in perception; to make more ready or ingenious.
- transitive v. To make more eager.
- transitive v. To make more pungent and intense.
- transitive v. To make biting, sarcastic, or severe.
- transitive v. To render more shrill or piercing.
- transitive v. To make more tart or acid; to make sour.
- transitive v. To raise, as a sound, by means of a sharp; to apply a sharp to.
- intransitive v. To grow or become sharp.
from The Century Dictionary and Cyclopedia
- To make sharp or sharper; render more acute, keen, eager, active, intensive, quick, biting, severe, tart, etc.: as, to sharpen a sword or a knife; to sharpen the appetite; to sharpen vinegar.
- In music, same as sharp, v., 2.
- To make something sharp; put a keen edge or sharp point on something.
- To grow or become sharp.
- In music, same as sharp.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- v. make (images or sounds) sharp or sharper
- v. make sharp or sharper
- v. make (one's senses) more acute
- v. make crisp or more crisp and precise
- v. give a point to
- v. put (an image) into focus
- v. become sharp or sharper
- v. raise the pitch of (musical notes)
sharp + -en (Wiktionary)