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Webster 1913 Edition

Undo

Un-do′

,
Verb.
T.
[AS.
und[GREEK]n
. See 1st
Un-
, and Do to perform.]
1.
To reverse, as what has been done; to annul; to bring to naught.
What’s done can not be
undone
.
Shakespeare
To-morrow, ere the setting sun,
She 'd all
undo
that she had done.
Swift.
2.
To loose; to open; to take to piece; to unfasten; to untie; hence, to unravel; to solve;
as, to
undo
a knot; to
undo
a puzzling question; to
undo
a riddle
.
Tennyson.
Pray you,
undo
this button.
Shakespeare
She took the spindle, and
undoing
the thread gradually, measured it.
Sir W. Scott.
3.
To bring to poverty; to impoverish; to ruin, as in reputation, morals, hopes, or the like;
as, many are
undone
by unavoidable losses, but more
undo
themselves by vices and dissipation, or by indolence
.
That quaffing and drinking will
undo
you,
Shakespeare

Webster 1828 Edition

Undo

UNDO

,
Verb.
T.
pret. undid; pp. undone.
1.
To reverse what has been done; to annul; to bring to naught any transaction. We can undo many kinds of work; but we cannot undo crimes, errors or faults.
Tomorrow ere the setting sun, she'd all undo what she had done.
2.
To loose; to open; to take to pieces; to unravel; to unfasten; to untie; as, to undo a knot.
3.
To ruin; to bring to poverty; to impoverish. Many are undone by unavoidable losses; but more undo themselves by vices and dissipation, or by indolence.
4.
To ruin, in a moral sense; to bring to everlasting destruction and misery.
5.
To ruin in reputation.

Definition 2024

undo

undo

See also: -undo

English

Verb

undo ‎(third-person singular simple present undoes, present participle undoing, simple past undid, past participle undone)

  1. To reverse the effects of an action. ant. syn.
    Fortunately, we can undo most of the damage to the system by the war.
    • 2011 October 15, Michael Da Silva, “Wigan 1 - 3 Bolton”, in BBC Sport:
      But Wigan undid their good work by conceding an avoidable second goal deep into first-half injury time.
  2. To unfasten. ant. syn.
    Could you undo my buckle for me?
  3. (figuratively) to be heading for or to cause a downfall
Synonyms
Antonyms
Translations

Noun

undo ‎(plural undos)

  1. (computing) An operation that reverses a previous action.
    How many undos does this program support?

Etymology 2

Adjective

undo

  1. Misspelling of undue.

References

  1. ↑ “undo”, in OED Online, Oxford: Oxford University Press, launched 2000.

Anagrams

Latin

Etymology

From unda ‎(“a wave”)

Pronunciation

  • (Classical) IPA(key): /ˈun.doː/, [ˈʊn.doː]

Verb

undō ‎(present infinitive undāre, perfect active undāvī, supine undātum); first conjugation

  1. I rise in waves.
  2. I overflow with, abound in.
  3. I wave, undulate.

Inflection

   Conjugation of undo (first conjugation)
indicative singular plural
first second third first second third
active present undō undās undat undāmus undātis undant
imperfect undābam undābās undābat undābāmus undābātis undābant
future undābō undābis undābit undābimus undābitis undābunt
perfect undāvī undāvistī undāvit undāvimus undāvistis undāvērunt, undāvēre
pluperfect undāveram undāverās undāverat undāverāmus undāverātis undāverant
future perfect undāverō undāveris undāverit undāverimus undāveritis undāverint
passive present undor undāris, undāre undātur undāmur undāminī undantur
imperfect undābar undābāris, undābāre undābātur undābāmur undābāminī undābantur
future undābor undāberis, undābere undābitur undābimur undābiminī undābuntur
perfect undātus + present active indicative of sum
pluperfect undātus + imperfect active indicative of sum
future perfect undātus + future active indicative of sum
subjunctive singular plural
first second third first second third
active present undem undēs undet undēmus undētis undent
imperfect undārem undārēs undāret undārēmus undārētis undārent
perfect undāverim undāverīs undāverit undāverīmus undāverītis undāverint
pluperfect undāvissem undāvissēs undāvisset undāvissēmus undāvissētis undāvissent
passive present under undēris, undēre undētur undēmur undēminī undentur
imperfect undārer undārēris, undārēre undārētur undārēmur undārēminī undārentur
perfect undātus + present active subjunctive of sum
pluperfect undātus + imperfect active subjunctive of sum
imperative singular plural
first second third first second third
active present — undā — — undāte —
future — undātō undātō — undātōte undantō
passive present — undāre — — undāminī —
future — undātor undātor — — undantor
non-finite forms active passive
present perfect future present perfect future
infinitives undāre undāvisse undātūrus esse undārī undātus esse undātum īrī
participles undāns — undātūrus — undātus undandus
verbal nouns gerund supine
nominative genitive dative/ablative accusative accusative ablative
undāre undandī undandō undandum undātum undātū

Derived terms

Descendants

References

Etymology

un- +‎ do

Pronunciation

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