Google Ngram Viewer results for hardens:
This graph shows how "hardens" have occurred between 1800 and 2008 in a corpus of English books.
Examples of usage for hardens:
And yet this creature, who, under our eyes, gradually hardens into crime, is one so richly dowered with rare gifts of person and mind, that in spite of his moral degeneracy, he fascinates the reader no less than the men and women supposed to come into actual contact with him. "George Eliot" , Mathilde Blind.
Quotes for hardens:
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