Definitions from Wiktionary (loose cannon)

▸ noun:  (nautical) A cannon that breaks loose from its moorings on a ship during battle or storm, with the potential to cause serious damage to the ship and her crew.
▸ noun:  (idiomatic, by extension) An uncontrolled or unpredictable person who causes damage to their own team, faction, political party, etc.
▸ verb:  (idiomatic) To behave in a way such as to cause damage to one's own faction, political party, etc.
▸ Also see loose_cannon


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