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undo - definition and synonyms

 
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verb undo pronunciation in British English /ʌnˈduː/
Word Forms
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present tense
I/you/we/theyundo
he/she/itundoes
present participleundoing
past tenseundid
past participleundone
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  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.
  2. 2
    [transitive] to have the effect of changing something back into its original, usually worse state
    She warned that one mistake could undo all their achievements.

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