Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • transitive v. To reverse or erase; annul: impossible to undo the suffering caused by the war.
  • transitive v. To untie, disassemble, or loosen: undo a shoelace.
  • transitive v. To open (a parcel, for example); unwrap.
  • transitive v. To cause the ruin or downfall of; destroy.
  • transitive v. To throw into confusion; unsettle.
  • transitive v. Obsolete To solve or interpret; unravel.
  • intransitive v. To come open or unfastened.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • v. To reverse the effects of an action. syn.
  • v. To unfasten. ant. syn.
  • v. to be heading for or to cause a downfall

from the GNU version of the Collaborative International Dictionary of English

  • transitive v. To reverse, as what has been done; to annul; to bring to naught.
  • transitive v. To loose; to open; to take to piece; to unfasten; to untie; hence, to unravel; to solve.
  • transitive v. To bring to poverty; to impoverish; to ruin, as in reputation, morals, hopes, or the like.

from The Century Dictionary and Cyclopedia

  • To leave unperformed or unexecuted: usually in opposition with do.
  • To put back into a former condition; reverse, as something which has been done; annul; bring to nought.
  • To untie or unfasten; unloose; unfix; open.
  • To find the answer or explanation of; solve.
  • To bring ruin or distress upon; ruin the morals, character, reputation, or prospects of; destroy; annihilate; spoil; ruin.
  • To reveal; disclose; unfold; explain.
  • To be too much for the power of; baffle.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • v. deprive of certain characteristics
  • v. cancel, annul, or reverse an action or its effect
  • v. cause to become loose
  • v. cause the ruin or downfall of
  • v. remove the outer cover or wrapping of

Etymologies

un- +‎ do (Wiktionary)

Examples

  • Leaving your parents out of your lives can result in undo stress, as then you will have to deal with their protests or their anquish over you.

    Archive 2005-04-01

  • Mandela added that economic development would, however, in the longer term undo the socio-economic conditions responsible for a large part of the problem of crime.

    ANC Daily News Briefing

  • Yet he realized that were Henry to be entrusted with the regency he would change in the most radical fashion the course of the ship of state; would introduce measures dear to the late Emperor Frederick, but to which he, the kaiser, was unalterably opposed, and would, in short, undo everything that he himself had done; so that when eventually the crown prince came of age there would be no longer any possibility of his continuing his father's policy, a policy which the emperor has been at great pains to inculcate into his boy.

    The Secret Memoirs of the Courts of Europe

  • She shuddered, as though to say the name would undo her again.

    UNIFICATION

  • OmniGraffle wisely sports an Undo button, and it supports many, many levels of undo, which is great.

    Macworld

  • Rename undo is the way to avoid all that, with little or no performance

    LXer Linux News

  • Every one else after that was just capitalizing on the works of Lotus developers. humans and microsoft? do they even know how to spell user interface design? and am I just way old or does anyone remember Visicalc that preceded both lotus and excel? as for undo, which is what the conversation started with, why would any one want it, we're all perfect right?

    Google Watch

  • When using Entity Framework, the recommended approach to undo is to discard your context with the changes you are interested in undoing.

    MSDN Blogs

  • Other features that look set to graduate include pictures in chat that shows the photograph of the person you are chatting to and something else called undo send, that I think might save a few blushes here and there.

    BBC News | Technology | World Edition

  • Disqus does not seem to have an 'undo' for that sort of thing.

    VOTD: New She & Him Video From Bring It On director Peyton Reed | /Film

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