Un*do" (?), v. t. [AS. undn. See 1st Un-, and Do to perform.]


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.


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.


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.


© Webster 1913.

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