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toughen

资料来源 : pyDict

(使)变坚韧,(使)变顽固

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Toughen \Tough"en\, v. i. & t. [imp. & p. p. {Toughened}; p. pr.
   & vb. n. {Toughening}.]
   To grow or make tough, or tougher.

资料来源 : WordNet®

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