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loose cannon
noun
- a person whose reckless behavior endangers the efforts or welfare of others.
loose cannon
noun
- a person or thing that appears to be beyond control and is potentially a source of unintentional damage
Word History and Origins
Origin of loose cannon1
Idioms and Phrases
One who is uncontrolled and therefore a serious and unpredictable danger. For example, We can't trust her to talk to the press—she's a loose cannon . This metaphoric expression alludes to cannon mounted on the deck of a sailing ship, which if dislodged during combat or a storm could cause serious damage to both vessel and crew by sliding about. Its figurative use dates from the first half of the 1900s.Example Sentences
Some of the grapevine talk has gotten back to her — how she’s a loose cannon or stirring the pot to cover up for complaints accusing her of misconduct.
That’s not to say that Harris is best as a loose cannon.
The Trump campaign appears to understand this reality, but its candidate has slipped back into loose cannon mode.
They have also tended to produce loose cannons throughout the ranks.
Jackie Malecek, 50, of Waterloo said she likes Trump for the reasons that many people don’t — how outspoken he is and “that he’s a little bit of a loose cannon.”
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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
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