loose cannon

noun

Definition of loose cannon

  1. :  a dangerously uncontrollable person or thing

Examples of loose cannon in a Sentence

  1. a politician who is regarded as a loose cannon by her colleagues

First Known Use of loose cannon

1889


LOOSE CANNON Defined for English Language Learners

loose cannon

noun

Definition of loose cannon for English Language Learners

  • : a person who cannot be controlled and who does or says things that cause problems, embarrassment, etc., for others

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