| 单词 | toughened | 
| 释义 | toughenverb  tough·en  ˈtə-fən    toughened; toughening ˈtə-fə-niŋ  ˈtəf-niŋ transitive verb   : to make tough   intransitive verb   : to become tough   toughened 1 of 2 adjectiveas in sturdyable to withstand hardship, strain, or exposure a group of toughened mountain bikers barreling up the hill Synonyms & Similar Words Relevance 
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 toughened2 of 2 verb1 as in strengthenedto increase the ability of (as a muscle) to exert physical force weight lifting will help toughen those flabby muscles of yours Synonyms & Similar Words 
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 2 as in hardenedto make able to withstand physical hardship, strain, or exposure hiking every morning through snow and ice toughened him considerably Synonyms & Similar Words 
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 3 as in stiffenedto make more harsh, uncompromising, or severe attempts to toughen conditions under which waivers from military service would be permitted Synonyms & Similar Words 
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