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3 definitions found

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

 tough·en /ˈtʌfən/
 (vt.)(vi.)(使)變堅韌,(使)變頑固

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.
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From: WordNet (r) 2.0

 toughen
      v : make tough or tougher; "This experience will toughen her"