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BNC: 20083 COCA: 15491
toughen
verb /ˈtʌf(ə)n/
present tense
I/you/we/theytoughen
he/she/ittoughens
present participletoughening
past tensetoughened
past participletoughened
  1. 1
    [I/T] to become more strict, or to make something more strict (使)变得严格

    Universities are toughening up their entrance requirements. 大学都在提高入学门槛。

  2. 2
    [I/T] to become mentally or physically stronger, or to make someone mentally or physically stronger (使)变强壮;(使)变坚强

    Prison life has toughened him up. 监狱生活使他变得坚强了。

     Synonyms and related words
    To become, or to make something stronger: strengthen, bolster, intensify...
     Synonyms and related words
  3. 3
    [I] to become more difficult to cut or eat 变得难切;变得难嚼
     Synonyms and related words
    To change consistency - general words: atomise, atomize, bake...

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