Usage History of 'knockout'

The following chart shows how frequently 'knockout' appeared in printed materials over time. For example, the word 'knockout' occurred 2 times in books in 1778 and 40,897 times in 2008. From 1778 to 2008, the word 'knockout' was used a total of 593,670 times in books scanned by Google. See Reference: Google Ngram project.

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