WordWeight : Weighing the Words

Pronunciation : Un*do"
Part of Speech : v.
Etymology : [AS. und. See 1st Un-, and Do to perform.]
Definition : 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. 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.

t.
Source : Webster's Unabridged Dictionary, 1913