What is the meaning of Toughening?

(p.pr.&vb.n.) of Toughen.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). toughening. Retrieved September 20, 2026, from http://smartdefine.org/toughening/definitions/2073564
ChicagoWebster's. 2011. "toughening" http://smartdefine.org/toughening/definitions/2073564 (accessed September 20, 2026).
HarvardWebster's 2011, toughening, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/toughening/definitions/2073564>.
MLAWebster's. "toughening" 28 May 2011. Web. 20 September 2026. <http://smartdefine.org/toughening/definitions/2073564>