Usually means: Unpredictable, uncontrollable person causing chaos.
Definitions Related words Mentions
We found 22 dictionaries that define the word loose cannon:

General (20 matching dictionaries)
  1. loose cannon: Longman Dictionary of Contemporary English
  2. loose cannon: Merriam-Webster
  3. loose cannon: Oxford Learner's Dictionaries
  4. loose cannon: American Heritage Dictionary of the English Language
  5. loose cannon: Collins English Dictionary
  6. loose cannon: Vocabulary.com
  7. loose-cannon: Wordnik
  8. loose cannon: Cambridge Advanced Learner's Dictionary
  9. loose cannon: Wiktionary
  10. loose cannon: The Wordsmyth English Dictionary-Thesaurus
  11. loose cannon: Infoplease Dictionary
  12. loose cannon: Dictionary.com
  13. Loose Cannon (comics), Loose Cannon, Loose cannon: Wikipedia, the Free Encyclopedia
  14. loose cannon: Rhymezone
  15. loose cannon: FreeDictionary.org
  16. loose cannon: Mnemonic Dictionary
  17. loose cannon: TheFreeDictionary.com
  18. Loose cannon: Phrase Finder

Miscellaneous (1 matching dictionary)
  1. loose cannon: Idioms

Slang (1 matching dictionary)
  1. loose cannon: Urban Dictionary

(Note: See loose_cannons as well.)

Definitions from Wiktionary (loose cannon)

noun:  (nautical) A cannon that breaks loose from its moorings on a ship during battle or storm, with the potential to cause serious damage to the ship and her crew.
noun:  (idiomatic, by extension) An uncontrolled or unpredictable person who causes damage to their own team, faction, political party, etc.
verb:  (idiomatic) To behave in a way such as to cause damage to one's own faction, political party, etc.

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