Usage History of 'tough'

The following chart shows how frequently 'tough' appeared in printed materials over time. For example, the word 'tough' occurred 4 times in books in 1572 and 559,554 times in 2008. From 1572 to 2008, the word 'tough' was used a total of 11,624,787 times in books scanned by Google. See Reference: Google Ngram project.

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