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loose cannon

An uncontrolled or unpredictable person who causes damage to his own friends, faction, political party, etc.
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Don't go near George; he is a loose cannon.

Submitted on March 12, 2010

Modified by paul8539 on February 27, 2022

Additional definitions for 'loose cannon':

loose cannonA cannon that breaks loose during battle or a storm and causes serious damage to the ship and its crew.
Loose CannonWho easily loses his or her temper and gets out of control
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    "loose cannon." Phrases.com. STANDS4 LLC, 2024. Web. 23 Dec. 2024. <https://www.phrases.com/phrase/loose-cannon_5173>.

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