Undo — Defs

01 v. t. To reverse, as what has been done; to annul; to bring to naught.

1.
To reverse, as what has been done; to annul; to bring to naught.
“What's done can not be undone.” — Shak.

“To-morrow, ere the setting sun, She 'd all undo that she had done.” — Swift.
2.
To loose; to open; to take to piece; to unfasten; to untie; hence, to unravel; to solve; as, to undo a knot; to undo a puzzling question; to undo a riddle.
“Pray you, undo this button.” — Shak.

“She took the spindle, and undoing the thread gradually, measured it.” — Sir W. Scott.
3.
To bring to poverty; to impoverish; to ruin, as in reputation, morals, hopes, or the like; as, many are undone by unavoidable losses, but more undo themselves by vices and dissipation, or by indolence.
“That quaffing and drinking will undo you,” — Shak.