toughen

动词 v.
中文释义

英文释义

动词 v.
  1. To make tough. transitive
    — The new training program is designed to toughen the athletes.
  2. To become tough. intransitive

词形变化

toughens present,singular,third-person toughening participle,present toughened participle,past toughened past

词汇关系

衍生词
retoughen toughenable toughener toughen up untoughened

词源

Etymology tree
English tough
English -en
English toughen
From tough + -en.
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