toughen
/ˈtʌfən/
- v.
- (使)变坚韧，(使)变顽强
中文释义来自 ECDICT
构词拆解
- -en
- (no longer productive) Denotes the past participle form when attached to a verb. · (archaic) Denotes a quasi-past participle or participle-like adjective when attached to a noun or verb.
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/ˈtʌfən/
中文释义来自 ECDICT