sharp·en

[shahr-puhn]
verb (used with object), verb (used without object)
to make or become sharp or sharper.

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

sharp·en·er, noun
pre·sharp·en, verb (used with object)
re·sharp·en, verb
un·sharp·ened, adjective
un·sharp·en·ing, adjective
well-sharp·ened, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
Cite This Source Link To sharpen
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World English Dictionary
sharpen (ˈʃɑːpən) [Click for IPA pronunciation guide]
 
vb
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
 
'sharpener
 
n

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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00:10
Sharpen is always a great word to know.
So is gobo. Does it mean:
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
a stew of meat, vegetables, potatoes, etc.
Example sentences
We can change the focus to a soft blur or sharpen it to crystal clarity.
Incorporate any feedback you might have received and take a moment to sharpen
  the work overall, if you can.
There are more photographs, for one thing, more anecdotes to help sharpen my
  impressions.
Western complaints about the piracy of intellectual property could sharpen rows
  with developing countries.
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