loose cannon
Noun

loose cannon (plural loose cannons)

  1. (nautical) A cannon that breaks loose from its moorings on a ship during battle or storm, which has the potential to cause serious damage to the ship and her crew.
  2. (idiomatic, by extension) An uncontrolled or unpredictable person who causes damage to their own team, faction, political party, etc.
    Jack is considered a loose cannon due to his volatile personality and his track record of being unable to maintain his composure.
Translations
  • French: électron libre
  • Italian: mina vagante
  • Russian: обезья́на с грана́той
  • Spanish: bala perdida
Verb

loose cannon (loose cannons, present participle loose cannoning; past and past participle loose cannoned)

  1. (idiomatic) To behave in a way such as to cause damage to one's own faction, political party etc.



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