Usage History of 'sharpened'

The following chart shows how frequently 'sharpened' appeared in printed materials over time. For example, the word 'sharpened' occurred 2 times in books in 1507 and 89,027 times in 2008. From 1507 to 2008, the word 'sharpened' was used a total of 2,089,554 times in books scanned by Google. See Reference: Google Ngram project.

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