toughen

verb
1
to become or make something stronger, so that it is not easily cut, broken, etc.
سخت کردن, مقاوم کردن, سفت کردن, محکم کردن, تقویت کردن
2
to make something such as laws or rules stricter
سخت‌تر کردن, سخت‌گیرانه کردن
The government is considering toughening up the law on censorship.
3
to make somebody stronger and more able to deal with difficult situations
سخت کردن, توانمند کردن, قوی کردن, مقاوم کردن, تقویت کردن
His parents sent him away to school to toughen him up.