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TOEFL IELTS BNC: 6417 COCA: 6632
undo
verb /ʌnˈduː/
present tense
I/you/we/theyundo
he/she/itundoes
present participleundoing
past tenseundid
past participleundone
  1. 1
    [T] to open, untie, or remove something so that it no longer closes, fastens, or connects another thing 打开;解开;松开;拆开

    He quickly undid the screws that held the lid on. 他很快地拧开了固定盖子的螺丝。

    I can't undo my belt. 我解不开皮带。

     Synonyms and related words
    To unfasten, or to come unfastened: unfasten, undo, detach...
     Synonyms and related words
  2. 2
    [T] to have the effect of changing something back into its original, usually worse state 使恢复原状;使无效

    She warned that one mistake could undo all their achievements. 她警告说一个错误就可能使他们所有的成就化为乌有。

     Synonyms and related words
    To change something: change, make into, convert...
    1. a.
      [I/T] computing to give a computer an instruction to ignore the last change that you made to a document 撤消(计算机最近一次执行过的命令)
       Synonyms and related words

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