Usage History of 'leapfrog'

The following chart shows how frequently 'leapfrog' appeared in printed materials over time. For example, the word 'leapfrog' occurred 6 times in books in 1704 and 8,489 times in 2008. From 1704 to 2008, the word 'leapfrog' was used a total of 153,508 times in books scanned by Google. See Reference: Google Ngram project.

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