loose cannon ( synonym found)
Definition of loose cannon:

°(nautical) a cannon that breaks loose during battle or a storm and causes serious damage to the ship and its crew.
°(idiom by extension) an uncontrolled or unpredictable person who causes damage to his own faction, political party etc.
Definition of loose cannon:

°(nautical) a cannon that breaks loose during battle or a storm and causes serious damage to the ship and its crew.
°(idiom by extension) an uncontrolled or unpredictable person who causes damage to his own faction, political party etc.
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