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| un·do·ing [ un d ing ] |
noun |
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1. act of bringing to ruin: the ruin, downfall, or destruction of somebody or something, or something that causes this
  Pride was our undoing.
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2. act of unfastening: the opening, unfastening, untying, or unwrapping of something
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3. act of nullifying something's effect: the canceling or reversing of the effect of an action
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