Usage History of 'purring'

The following chart shows how frequently 'purring' appeared in printed materials over time. For example, the word 'purring' occurred 2 times in books in 1683 and 23,473 times in 2008. From 1683 to 2008, the word 'purring' was used a total of 357,622 times in books scanned by Google. See Reference: Google Ngram project.

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