To become or cause to become tough or strong:
To make resistant to hardship, especially through continued exposure:
"toughen." YourDictionary, n.d. Web. 13 October 2018. <http://thesaurus.yourdictionary.com/toughen>.
toughen. (n.d.). Retrieved October 13th, 2018, from http://thesaurus.yourdictionary.com/toughen
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