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sharpen

[shahr-puh n] /ˈʃɑr pən/
verb (used with object), verb (used without object)
1.
to make or become sharp or sharper.
Origin
late Middle English
1400-1450
1400-50; late Middle English; see sharp, -en1
Related forms
sharpener, noun
presharpen, verb (used with object)
resharpen, verb
unsharpened, adjective
unsharpening, adjective
well-sharpened, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for un sharpened

sharpen

/ˈʃɑːpən/
verb
1.
to make or become sharp or sharper
2.
(music) to raise the pitch of (a note), esp by one chromatic semitone Usual US and Canadian word sharp
Derived Forms
sharpener, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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