toughen
/ˈtʌfən/ verb C2- To make tough. · The new training program is designed to toughen the athletes.· A cold shower every morning will toughen your skin.
- To become tough.
He/she/it toughens · Past toughened · Past participle toughened · -ing form toughening
Verb forms
- Base form
- toughen
- He/she/it
- toughens
- Past
- toughened
- Past participle
- toughened
- -ing form
- toughening
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