Usage History of 'brighten'

The following chart shows how frequently 'brighten' appeared in printed materials over time. For example, the word 'brighten' occurred 2 times in books in 1649 and 47,717 times in 2008. From 1649 to 2008, the word 'brighten' was used a total of 774,866 times in books scanned by Google. See Reference: Google Ngram project.

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