verb (used with object), verb (used without object)
to make or become sharp or sharper.

1400–50; late Middle English; see sharp, -en1

sharpener, noun
presharpen, verb (used with object)
resharpen, verb
unsharpened, adjective
unsharpening, adjective
well-sharpened, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To sharpen
World English Dictionary
sharpen (ˈʃɑːpən)
1.  to make or become sharp or sharper
2.  music Usual US and Canadian word: sharp to raise the pitch of (a note), esp by one chromatic semitone

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
In each case a chimpanzee modified a branch by breaking off one or two ends
  and, frequently, using its teeth to sharpen the stick.
Incorporate any feedback you might have received and take a moment to sharpen
  the work overall, if you can.
The point of these chemicals is to sharpen the spotlight, to keep us fixated on
  the task at hand.
But they sharpen only a small portion of the telescope's field of view.
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