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undoing

/ʌnˈduːɪŋ/ noun C1
  1. The act of loosening or unfastening
  2. Ruin; defeat, (also) that which causes defeat or ruin. · In the end, his jealousy was his undoing.
  3. Annulment; reversal

Plural undoings

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From the library

As soon as she had made out the proper way of nursing it, (which was to twist it up into a sort of knot, and then keep tight hold of its right ear and left foot, so as to prevent its undoing itself,) she carried it out into the open air.
Alice's Adventures in Wonderland, p. 44 · B2
The boy had some slight difficulty in undoing the heavy iron gates, and we heard the hoarse roar of the Doctor’s voice and saw the fury with which he shook his clinched fists at him.
The Adventures of Sherlock Holmes, p. 61 · B2
Learn then from this story not to fear the fruits of the past, but rather to be circumspect in the future, that those foul passions whereby our family has suffered so grievously may not again be loosed to our undoing.
The Hound of the Baskervilles, p. 10 · C1

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.