Definition of undo in English:


Line breaks: undo
Pronunciation: /ʌnˈduː

verb (undoes, undoing; past undid; past participle undone)

[with object]
  • 2Cancel or reverse the effects or results of (a previous action or measure): there wasn’t any way Evelyn could undo the damage
    More example sentences
    • The Democrats are strongly opposed to the measures that undo many of the agreements that were struck during the original diesel package in 1999.
    • But this time, it has more to do with rectifying or even undoing some of the damage that resulted from the last international economic movement.
    • Their work may be undone as a result of the popular will.
    revoke, overrule, overturn, repeal, rescind, reverse, retract, take back, rule against, disallow, veto, countermand, cancel, annul, nullify, render null and void, invalidate, render invalid, negate, abrogate, disestablish, make ineffective, set aside, do away with, wipe out, bring to an end; Law avoid, vacate
    archaic recall
    rare disannul
  • 2.1Cancel (the last command executed by a computer): you can frequently undo the error if you notice it in time
    More example sentences
    • These range from nice functions like undoing and redoing a command, running spellcheck and printing a document.
    • Repeating the u command undoes each step in turn; the Ctrl-R keystroke puts them back (redo).
    • We undo the Ctrl-J with Ctrl-Shift - (that's Control-Shift-Hyphen) and type in the semicolon.


Computing Back to top  
  • A feature of a computer program that allows a user to cancel or reverse the last command executed: [as modifier]: the undo command
    More example sentences
    • However Dreamweaver has really gone to town on this feature making it extremely easy to use, it allows users a virtually unlimited number of number of undos.
    • And the time they save in avoiding undos is invaluable.
    • Graphic designers love to hear that they can revert to any previous version of a document by using the undo feature in the web-based management interface.


Old English undōn (see un-2, do1).

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