Definition of toughen verb from the Oxford Advanced American Dictionary

     

    toughen

     verb
    verb
    NAmE//ˈtʌfn//
     
    Verb Forms present simple I / you / we / they toughen
     
    he / she / it toughens
     
    past simple toughened
     
    -ing form toughening
     
     
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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 someone stronger and more able to deal with difficult situations His parents sent him away to school to toughen him up.
See the Oxford Advanced Learner's Dictionary entry: toughen