plural loose cannons
: a person who cannot be controlled and who does or says things that cause problems, embarrassment, etc., for others
a politician who is regarded as a loose cannon by her colleagues
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“Loose cannon.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/loose%20cannon. Accessed 23 Jun. 2026.
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