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undo

[ uhn-doo ]
/ ʌnˈdu /
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See synonyms for: undo / undid / undoing / undone on Thesaurus.com

verb (used with object), un·did [uhn-did], /ʌnˈdɪd/, un·done [uhn-duhn], /ʌnˈdʌn/, un·do·ing.
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Origin of undo

First recorded before 900; Middle English; Old English undōn; cognate with Dutch ontdoen; see origin at un-2, do1

OTHER WORDS FROM undo

un·do·a·ble, adjective

WORDS THAT MAY BE CONFUSED WITH undo

undo , undue
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

How to use undo in a sentence

British Dictionary definitions for undo

undo
/ (ʌnˈduː) /

verb -does, -doing, -did or -done (mainly tr)
(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

Derived forms of undo

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
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