Usage History of 'underscoring'

The following chart shows how frequently 'underscoring' appeared in printed materials over time. For example, the word 'underscoring' occurred 2 times in books in 1746 and 20,163 times in 2008. From 1746 to 2008, the word 'underscoring' was used a total of 350,308 times in books scanned by Google. See Reference: Google Ngram project.

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