Usage History of 'roughing'

The following chart shows how frequently 'roughing' appeared in printed materials over time. For example, the word 'roughing' occurred 2 times in books in 1723 and 16,376 times in 2008. From 1723 to 2008, the word 'roughing' was used a total of 409,515 times in books scanned by Google. See Reference: Google Ngram project.

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