What is the meaning of Toughened?

(imp.&p.p.) of Toughen.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). toughened. Retrieved September 25, 2026, from http://smartdefine.org/toughened/definitions/2073563
ChicagoWebster's. 2011. "toughened" http://smartdefine.org/toughened/definitions/2073563 (accessed September 25, 2026).
HarvardWebster's 2011, toughened, Smart Define, viewed 25 September, 2026, <http://smartdefine.org/toughened/definitions/2073563>.
MLAWebster's. "toughened" 28 May 2011. Web. 25 September 2026. <http://smartdefine.org/toughened/definitions/2073563>
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