| 单词 | toughen |
| 例句 | toughen verb 1.•the process toughens the wood fibers:strengthen, fortify, reinforce, harden, temper, anneal. 2.•measures to toughen up prison discipline:make stricter, make more severe, stiffen, tighten up | informal beef up. |
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英语同义词词典收录了14896条英语词条，基本涵盖了全部常用同义词或反义词的辨析及翻译，是英语学习的有利工具。