Usage History of 'tightened'

The following chart shows how frequently 'tightened' appeared in printed materials over time. For example, the word 'tightened' occurred 2 times in books in 1607 and 158,829 times in 2008. From 1607 to 2008, the word 'tightened' was used a total of 2,866,235 times in books scanned by Google. See Reference: Google Ngram project.

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