Usage History of 'crooning'

The following chart shows how frequently 'crooning' appeared in printed materials over time. For example, the word 'crooning' occurred 2 times in books in 1770 and 13,243 times in 2008. From 1770 to 2008, the word 'crooning' was used a total of 207,945 times in books scanned by Google. See Reference: Google Ngram project.

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