Loose-cannon



noun
1.
a person whose reckless behavior endangers the efforts or welfare of others.
noun
1.
a person or thing that appears to be beyond control and is potentially a source of unintentional damage

noun phrase

A person who is quite likely to cause damage; a wildly irresponsible person: Haig is a loose cannon on a pitching deck/ His detractors call him a loose cannon who makes recommendations in public before consulting (1977+)
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.

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