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.
- un·do·a·ble, adjective
- undo , undue
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use undo in a sentence
It was probably the most difficult thing I’ve ever done, because you’re walking in and saying, “The second that this happens, you can’t undo it.”Full Transcript: Sean Spicer on ‘The Carlos Watson Show’ | Daniel Malloy | August 26, 2020 | Ozy
Weber argues that voters should pass Proposition 16, which would undo the state’s current ban on affirmative action policies.
One example of the work being done to advance systemic change is California’s Proposition 16, which would undo our state’s ban on affirmative action.COVID-19 Highlighted Pay Disparities; November’s Election Can Help Fix Them | Shirley Weber | August 13, 2020 | Voice of San Diego
A union-backed proposal to partially undo a city law restricting union-friendly contracts will have to wait for another election.Politics Report: Down Goes One Hot-Button Ballot Measure | Andrew Keatts | July 18, 2020 | Voice of San Diego
So I’m just undoing the wrong that these earlier presidents did.Does the President Matter as Much as You Think? (Ep. 404) | Stephen J. Dubner | February 6, 2020 | Freakonomics
But then the question becomes, how do you undo gerrymandering?
We should undo that double standard by offering similar protections to every young Black man who is arrested in this country.
And yet, ultimately, the Supreme Court holds the power to uphold or undo what it has taken him years to accomplish.
Underlying all of this legal maneuvering is the social fact that marriages are hard to undo.
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 | THE DAILY BEAST
I didnt think much of that, but he said afterward, A man may do in an hour what he cant undo in a lifetime.Tessa Wadsworth's Discipline | Jennie M. Drinkwater
"You must live and undo your misdeeds if you can, dear grandfather," said Richard, whose own conscience was as yet very easy.God Wills It! | William Stearns Davis
What if that uncanny demon should return, and undo all his labor by some diabolical plan or act?A Fortune Hunter; Or, The Old Stone Corral | John Dunloe Carteret
“undo him then, and be damned,” growled the skipper, and rolled off to drink himself drunk.Eric, or Little by Little | Frederic W. Farrar
In some instances the public mind was not made up concerning a law, and one Assembly would undo the work of its predecessor.A short history of Rhode Island | George Washington Greene
British Dictionary definitions for undo
(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
- undoer, 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