toughen
/ˈtʌfən/verb
1- make or become stronger or more resilient（使）更坚强（或坚韧）：
with obj. he tried to toughen his son up by sending him to public school他把儿子送进公学以使其变得更坚强
no obj. a falcon has scaly skin on its legs that toughens up very quickly.猎鹰的腿上有能很快硬化的鳞状皮。
1.1
- with obj. make (rules or a policy) stricter and more harsh使（规定, 政策）更为严格, 苛刻：
proposals to toughen up sentencing policy.
关于强化判决政策的建议。
派生词