Usage History of 'redline'

The following chart shows how frequently 'redline' appeared in printed materials over time. For example, the word 'redline' occurred 2 times in books in 1824 and 2,489 times in 2008. From 1824 to 2008, the word 'redline' was used a total of 44,233 times in books scanned by Google. See Reference: Google Ngram project.

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