- to reverse the doing of; cause to be as if never done: Murder once done can never be undone.
- to do away with; erase; efface: to undo the havoc done by the storm.
- to bring to ruin or disaster; destroy: In the end his lies undid him.
- to unfasten by releasing: to undo a gate; to undo a button.
- to untie or loose (a knot, rope, etc.).
- to open (a package, wrapping, etc.).
- Archaic. to explain; interpret.
Origin of undo
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for undo
But then the question becomes, how do you undo gerrymandering?Seriously, Democrats: You’re Done in Dixie
December 10, 2014
We should undo that double standard by offering similar protections to every young Black man who is arrested in this country.We Need More Ferguson-style Grand Juries
November 30, 2014
And yet, ultimately, the Supreme Court holds the power to uphold or undo what it has taken him years to accomplish.From POTUS to SCOTUS: Obama’s Big Move?
November 17, 2014
Underlying all of this legal maneuvering is the social fact that marriages are hard to undo.Gay Marriage Chaos Begins
November 11, 2014
The wind and the dust in this climate can undo even the hardiest things.Whatever You Do Someone Will Die. A Short Story About Impossible Choices in Iraq
Nathan Bradley Bethea
August 31, 2014
Come, captain, undo these ropes, and make up your mind quickly.In the Midst of Alarms
Come down, and undo the shop window, that I may get in that way.'Barnaby Rudge
If a man can do whatever he thinks of—can he undo that which he has done?Now We Are Three
Joe L. Hensley
No; but to go on as if hard work now can ever undo what years of idleness have done.The First Violin
And, if I haply had erred, to undo the wrong, and release you.Poems
William D. Howells
- (also intr) to untie, unwrap, or open or become untied, unwrapped, etc
- to reverse the effects of
- to cause the downfall of
- obsolete to explain or solve
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 undo
Online Etymology Dictionary, © 2010 Douglas Harper