Online Google Dictionary

toughen 中文解釋 wordnet sense Collocation Usage Collins Definition
Verb
/ˈtəfən/,
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toughening, present participle; toughened, past tense; toughens, 3rd person singular present; toughened, past participle;
  1. Make or become tougher
    • - he tried to toughen his son up by sending him to public school
    • - if removed from the oven too soon meringues shrink and toughen
  2. Make (rules or a policy) stricter and more harsh
    • - new congressional efforts to toughen the laws

  1. make tough or tougher; "This experience will toughen her"