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  1. toughen

    • IPA[ˈtəfən]

    美式

    • v.
      make or become tougher;make (rules or a policy) stricter and more harsh
    • verb: toughen, 3rd person present: toughens, gerund or present participle: toughening, past tense: toughened, past participle: toughened

    • 釋義

    動詞

    • 更多解釋
    • IPA[ˈtʌfn]

    英式

    • v.
      make or become stronger or more resilient: he tried to toughen his son up by sending him to public school a falcon has scaly skin on its legs that toughens up very quickly

    Oxford Dictionary

  2. 知識+