toughen - definition and synonyms

verb 

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/ˈtʌf(ə)n/
present tense
I/you/we/theytoughen
he/she/ittoughens
present participletoughening
past tensetoughened
past participletoughened
  1. 1
    [intransitive/transitive] to become more strict, or to make something more strict
  2. 3
    [intransitive] to become more difficult to cut or eat