English Dictionary

loose cannon

名詞

広義 慣用表現

(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.

日本語の意味

（海上）戦闘や嵐の際に、船に固定されていた大砲がほどけ、船や乗組員に深刻な被害を及ぼす可能性のある大砲

During the storm, a loose cannon barreled down the deck and crushed several barrels, threatening to wreck the ship and injure the crew.

嵐の最中、係留が外れた大砲が甲板を転がり、いくつかの樽を押し潰して船体や乗組員に深刻な被害を与える危険があった。

意味（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.

意味（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.

loose cannons （ plural ）