Usage History of 'sighing'

The following chart shows how frequently 'sighing' appeared in printed materials over time. For example, the word 'sighing' occurred 2 times in books in 1564 and 94,932 times in 2008. From 1564 to 2008, the word 'sighing' was used a total of 1,381,953 times in books scanned by Google. See Reference: Google Ngram project.

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