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2 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 toughening
 韌化

From: Webster's Revised Unabridged Dictionary (1913)

 Tough·en v. i. & t. [imp. & p. p. Toughened p. pr. & vb. n. Toughening.] To grow or make tough, or tougher.