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单词 toughen
释义

WordReference Random House Learner's Dictionary of American English © 2024
tough•en /ˈtʌfən/USA pronunciation   v. 
  1. to (cause to) become tough or tougher: [no object]This metal toughens under higher temperatures.[~ + object]The union toughened its stance.
tough•en•er, n. [countable]

WordReference Random House Unabridged Dictionary of American English © 2024
tough•en  (tuf′ən),USA pronunciation v.t., v.i. 
  1. to make or become tough or tougher.
  • tough + -en1 1575–85
tough ′en•er, n. 
    harden, firm, strengthen, stiffen.

Collins Concise English Dictionary © HarperCollins Publishers::
toughen /ˈtʌfən/ vb
  1. to make or become tough or tougher
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更新时间：2025/2/23 15:43:30