1. preterit tense undid; participle passive undone.
2. To reverse what has been done; to annul; to bring to naught any transaction. We can undo many kinds of work; but we cannot undo crimes, errors or faults.
5. To ruin; to bring to poverty; to impoverish. Many are undone by unavoidable losses; but more undo themselves by vices and dissipation, or by indolence.
6. To ruin, in a moral sense; to bring to everlasting destruction and misery.
7. To ruin in reputation.
