Definition of toughen verb from the Oxford Advanced Learner's Dictionary

     

    toughen

     verb
    verb
    BrE BrE//ˈtʌfn//
     
    ; NAmE NAmE//ˈtʌfn//
     
    Verb Forms present simple I / you / we / they toughen
    BrE BrE//ˈtʌfn//
     
    ; NAmE NAmE//ˈtʌfn//
     
    he / she / it toughens
    BrE BrE//ˈtʌfnz//
     
    ; NAmE NAmE//ˈtʌfnz//
     
    past simple toughened
    BrE BrE//ˈtʌfnd//
     
    ; NAmE NAmE//ˈtʌfnd//
     
    past participle toughened
    BrE BrE//ˈtʌfnd//
     
    ; NAmE NAmE//ˈtʌfnd//
     
    -ing form toughening
    BrE BrE//ˈtʌfnɪŋ//
     
    ; NAmE NAmE//ˈtʌfnɪŋ//
     
     
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  1. 1[transitive, intransitive] toughen (something) (up) to become or make something stronger, so that it is not easily cut, broken, etc. toughened glass
  2. 2[transitive] toughen something (up) to make something such as laws or rules stricter The government is considering toughening up the law on censorship.
  3. 3[transitive] toughen somebody (up) to make somebody stronger and more able to deal with difficult situations His parents sent him away to school to toughen him up.
See the Oxford Advanced American Dictionary entry: toughen