"toughen." YourDictionary, n.d. Web. 12 October 2018. <http://www.yourdictionary.com/toughen>.
toughen. (n.d.). Retrieved October 12th, 2018, from http://www.yourdictionary.com/toughen
tr. & intr.v.
(third-person singular simple present toughens, present participle toughening, simple past and past participle toughened)
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