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| un·do [ un d ] (past un·did [ un díd ], past participle un·done [ un dún ], present participle un·do·ing, 3rd person present singular un·does [ un dúz ]) |
verb |
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1. transitive and intransitive verb unfasten: to open, unfasten, untie, or unwrap something, or become unfastened, untied, or unwrapped
 I can't undo this button.
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2. transitive verb nullify something: to cancel or reverse the effect of an action
What's done can't be undone.
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3. transitive verb reverse effect of computer command: to cancel the effect of the last command or action done on a computer, restoring the material being worked on to its previous condition
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4. transitive verb ruin somebody: to bring somebody or something to ruin or disaster
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literary
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