Loose Cannon Definition
noun
One that is uncontrolled and therefore poses danger.
American Heritage
A careless, uncontrollable person whose words or actions cause embarrassment or harm to others.
Webster's New World
verb
(idiomatic) To behave in a way such as to cause damage to one's own faction, political party etc.
Wiktionary
Origin of Loose Cannon
From the threat posed by loose cannon rolling about a warship under sail
From American Heritage Dictionary of the English Language, 5th Edition
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