sharpen

(redirected from sharpening up)
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Related to sharpening up: Sharpening stone

sharpen

[′shär·pən]
(engineering)
To give a thin keen edge or a sharp acute point to.
(graphic arts)
To decrease the size of the dots on a screened halftone.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.