loose cannonRate this phrase:(0.00 / 0 votes)Say it
An uncontrolled or unpredictable person who causes damage to his own friends, faction, political party, etc.

Don't go near George; he is a loose cannon.

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.
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"loose cannon." Phrases.net. STANDS4 LLC, 2017. Web. 23 Nov. 2017. <http://www.phrases.net/phrase/loose-cannon_5173>.

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