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. --Tennyson.
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.