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The definition of sharpen

2 Definitions of: sharpen

    1. verb, to make or become sharp or sharper
    2. verb, music to raise the pitch of (a note), esp by one chromatic semitone. Usual US and Canadian word: sharp
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    4. Show me the etymology of the word: sharpen
Synonyms: edge, hone, whet, grind, strop
 

From Collins

©HarperCollins 2008. Collins English Dictionary definition of sharpen