undoing

noun

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.”

   “So far as the ape was concerned, Sabor reasoned correctly. The little fellow crouched trembling just an instant, but that instant was quite long enough to prove his undoing.”

   “The extra 30 minutes could not separate the sides and led to a nerve-shredding finale that has so often been England's undoing, with a dismal record of just one win in seven shootouts at major tournaments before this.”

3. Annulment; reversal

verb

1. (form-of, gerund, participle, present)present participle and gerund of undo