Usage History of 'crackup'

The following chart shows how frequently 'crackup' appeared in printed materials over time. For example, the word 'crackup' occurred 2 times in books in 1913 and 359 times in 2008. From 1913 to 2008, the word 'crackup' was used a total of 10,665 times in books scanned by Google. See Reference: Google Ngram project.

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