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Related to sharpening: Sharpening stone
tr. & intr.v. sharp·ened, sharp·en·ing, sharp·ens
To make or become sharp or sharper.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
the act of making the edge of something very thin or of making its end pointedone of several very thin, small pieces of wood produced when one sharpens a pencil
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014