Usage History of 'thickens'

The following chart shows how frequently 'thickens' appeared in printed materials over time. For example, the word 'thickens' occurred 8 times in books in 1590 and 18,771 times in 2008. From 1590 to 2008, the word 'thickens' was used a total of 487,013 times in books scanned by Google. See Reference: Google Ngram project.

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