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undo

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verb undo pronunciation in American English /ʌnˈdu/ 
Word Forms
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present tense
I/you/we/theyundo
he/she/itundoes
present participleundoing
past tenseundid
past participleundone
  1. 1
    [transitive] to open, untie, or remove something so that it no longer closes, fastens, or connects another thing

    He quickly undid the screws that held the lid on.

    I can't undo my belt.

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