sharpen definition by Webster's New World
transitive verb, intransitive verb
to make or become sharp or sharper
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
- sharpener noun
sharpen definition by American Heritage Dictionary
tr. & intr.v. sharp·ened, sharp·en·ing, sharp·ens
To make or become sharp or sharper.
- sharpˈen·er noun