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toughens is toughen's Simple Present

toughen

US [ˈtʌf(ə)n]
UK ['tʌf(ə)n]
  • v.使[变]强韧;使[变]硬;使[变]强健;使[变]坚强
  • Web锻炼人;变坚韧;增韧
Simple Present:toughens  Present Participle:toughening  Past Tense:toughened  
v.
1.
使[变]强韧;使[变]硬;使[变]强健;使[变]坚强,使[变]顽固;使[变]困难

Sample Sentence

Definition:
Category:AllAll,OralOral,WrittenWritten,TitleTitle,TechnicalTechnical
Source:AllAll,DictionaryDictionary,WebWeb
Difficulty:AllAll,EasyEasy,MiddleMiddle,HardHard
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