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1. Oxford American Dictionary

   undo

   • IPA[ˌənˈdo͞o]

   美式

   • v.
     unfasten, untie, or loosen (something)；cancel or reverse the effects or results of (a previous action or measure)
   • n.
     a feature of a computer program that allows a user to cancel or reverse the last one or more commands executed

   • verb: undo, 3rd person present: undoes, gerund or present participle: undoing, past tense: undid, past participle: undone

2. • 釋義

   v.

   動詞

   • 1. unfasten, untie, or loosen (something) the knot was difficult to undo 同義詞 unfasten, unbutton, unhook, untie, unlace, ... 更多unbind, unfetter, unshackle, unmanacle, unbridle, unlock, unbolt, uncouple, unhitch, unlink, unclick, loosen, loose, disentangle, disentwine, extricate, release, detach, free, set free, liberate, open, unseal, unwrap, let out, disconnect, disjoin, disengage, disunite, separate反義詞 fasten, do up
   • 2. cancel or reverse the effects or results of (a previous action or measure) there wasn't any way Evelyn could undo the damage 同義詞 revoke, overrule, overturn, repeal, rescind, ... 更多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, avoid, vacate, archaicrecall, raredisannul反義詞 ratify
   • ▪ cancel (the last one or more commands executed by a computer) you can frequently undo the error if you notice it in time
   • 3. formal cause the downfall or ruin of Iago's hatred of women undoes him 同義詞 ruin, undermine, put an end to, put at risk, subvert, ... 更多overturn, topple, scupper, scotch, sabotage, spoil, mess up, make a mess of, quash, squelch, crush, harm, cripple, impair, mar, destroy, devastate, play havoc with, wreck, smash, shatter, annihilate, eradicate, obliterate, defeat, cancel out, neutralize, render ineffective, thwart, upset, foil, frustrate, hamper, hinder, obstruct, informalbotch, blow, put the kibosh on, foul up, muck up, louse up, blow a hole in, do for, cock up, throw a spanner in the works of, rain on someone's parade, throw a monkey wrench in the works of, vulgar slangfuck up, bugger up, balls up, archaicbring to naught反義詞 further, enhance, help

   n.

   名詞

   • 1. a feature of a computer program that allows a user to cancel or reverse the last one or more commands executed the undo command