toughen
verb /ˈtʌfn/
  /ˈtʌfn/
Verb Forms
| present simple I / you / we / they toughen |    /ˈtʌfn/   /ˈtʌfn/  | 
| he / she / it toughens |    /ˈtʌfnz/   /ˈtʌfnz/  | 
| past simple toughened |    /ˈtʌfnd/   /ˈtʌfnd/  | 
| past participle toughened |    /ˈtʌfnd/   /ˈtʌfnd/  | 
| -ing form toughening |    /ˈtʌfnɪŋ/   /ˈtʌfnɪŋ/  | 
- [transitive, intransitive] toughen (something) (up) to become or make something stronger, so that it is not easily cut, broken, etc.
- toughened glass
 
 - [transitive] toughen something (up) to make something such as laws or rules stricter
- The government is considering toughening up the law on censorship.
 
 - [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.