v.（使某物[人]）坚韧，坚强，强硬( toughen的第三人称单数 );
例句:
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They believe that participating in fights toughens boys and shows them how to be men.
他们认为参与打架会使男孩子变得坚强，教会他们怎样成为男人。
《柯林斯高阶英汉双解学习词典》
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