Dictionary.com
definitions
  • synonyms

undo

[uhn-doo]
verb (used with object), un·did, un·done, un·do·ing.
  1. to reverse the doing of; cause to be as if never done: Murder once done can never be undone.
  2. to do away with; erase; efface: to undo the havoc done by the storm.
  3. to bring to ruin or disaster; destroy: In the end his lies undid him.
  4. to unfasten by releasing: to undo a gate; to undo a button.
  5. to untie or loose (a knot, rope, etc.).
  6. to open (a package, wrapping, etc.).
  7. Archaic. to explain; interpret.
Show More

Origin of undo

before 900; Middle English; Old English undōn; cognate with Dutch ontdoen. See un-2, do1
Related formsun·do·a·ble, adjective
Can be confusedundo undue
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words

unlock, unravel, loosen, mar, reverse, wreck, subvert, ruin, shatter, abolish, quash, spoil, offset, negate, destroy, overturn, undermine, annul, unloosen, unbind

Examples from the Web for undoes

Contemporary Examples

Historical Examples

  • The deed done to Helen strikes every Greek man till he undoes it.

    Homer's Odyssey

    Denton J. Snider

  • Whichever of these courses we pursue, the hurry with which we pursue it undoes us.

  • A day like this undoes the work of a hundred numbers of the Jacobin papers.

  • (He bends again and undoes the buttons of Stephen's waistcoat) To breathe.

    Ulysses

    James Joyce

  • The very thought of it undoes me—with an absolute shock of sheepishness.

    The Return

    Walter de la Mare


British Dictionary definitions for undoes

undo

verb -does, -doing, -did or -done (mainly tr)
  1. (also intr) to untie, unwrap, or open or become untied, unwrapped, etc
  2. to reverse the effects of
  3. to cause the downfall of
  4. obsolete to explain or solve
Show More
Derived Formsundoer, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for undoes

undo

v.

Old English undon "to unfasten and open" (a window or door), "to unfasten by releasing from a fixed position," from un- (2) + do (v.). The notion is of "to annul something that was done." Related: Undone; undoing.

Show More
Online Etymology Dictionary, © 2010 Douglas Harper