toughen['tʌfən]

• vt.
  • 使变坚韧；使变坚强；使变强硬；使变顽强；使变困难：

    The government has toughened the fight against corruption.

    政府已采取更有力的措施与腐败做斗争。

• vi.
  • 变坚韧；变坚强；变强硬；变顽强；变困难：

    She has toughened up a lot since last year.

    自去年以来她已经变得坚强多了。