undo - definition and synonyms

 
verb 

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/ʌnˈduː/
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.

  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.

    1. a.
      [intransitive/transitive] computing to give a computer an instruction to ignore the last change that you made to a document