undo

/'ʌn'du:/
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Definition
  1. Verb:
    • To open, untie, or loosen something that is fastened or closed: "undo" means to reverse the action of fastening, tying, or closing something.
    • To reverse the effects of an action; to cancel or annul: "undo" means to make something that has been done as if it never happened.
    • To cause the downfall, ruin, or destruction of someone or something: "undo" means to bring about the failure or ruin of a person, plan, or situation.
Usage Examples
  • Verb (To open/untie):
    • She had to undo the knot to open the bag.
    • Can you help me undo this button?
  • Verb (To reverse/cancel):
    • I wish I could undo the mistake I made yesterday.
    • The software has an 'undo' command to reverse the last action.
  • Verb (To cause ruin):
    • His dishonesty ultimately undid his political career.
    • The scandal undid all the trust they had built.
Advanced Usage

  • "to be undone": to be ruined or destroyed; to be in a state of being unfastened.

    • After the evidence was revealed, the criminal's alibi was completely undone.
    • His shoelaces were undone as he ran.

  • "to undo oneself": to cause one's own ruin or failure.

    • With his reckless spending, he is slowly undoing himself.
Variants and Related Words

  • Undone (adj): Not fastened or tied; not completed or finished; ruined.

    • The package remained undone on the table.
    • She left the work undone.

  • Undoing (n): A cause of someone's downfall, failure, or ruin.

    • His pride was his undoing.
Synonyms
  • Unfasten: To open something that is closed or secured.
  • Reverse: To change something to its opposite or previous state.
  • Ruin: To cause the destruction or downfall of something.
Related Phrasal Verbs

(Note: "undo" is not commonly used with particles to form distinct phrasal verbs with different meanings. Its core meanings are expressed by the verb itself.)

Related Idioms
  • What's done cannot be undone: This proverb means that once something has happened, it cannot be changed or reversed.
    • I know you regret sending that email, but what's done cannot be undone.
Verb
  1. remove the outer cover or wrapping of
    • Let's unwrap the gifts!
    • undo the parcel
  2. cause to become loose
    • undo the shoelace
    • untie the knot
    • loosen the necktie
  3. cause the ruin or downfall of
    • A single mistake undid the President and he had to resign
  4. deprive of certain characteristics
  5. cancel, annul, or reverse an action or its effect
    • I wish I could undo my actions

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