Usually means: Automatic response without thoughtful consideration.
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We found 16 dictionaries that define the word knee-jerk:

General (12 matching dictionaries)
  1. knee-jerk: Merriam-Webster
  2. knee-jerk: Oxford Learner's Dictionaries
  3. knee-jerk: American Heritage Dictionary of the English Language
  4. Knee-Jerk, Knee-jerk, knee-jerk: Wordnik
  5. knee-jerk: Cambridge Advanced Learner's Dictionary
  6. knee-jerk: Wiktionary
  7. knee-jerk: The Wordsmyth English Dictionary-Thesaurus
  8. knee-jerk: Dictionary.com
  9. knee-jerk: Cambridge Essential American English Dictionary
  10. knee-jerk: TheFreeDictionary.com

Medicine (3 matching dictionaries)
  1. Knee-jerk: MedTerms.com Medical Dictionary
  2. knee-jerk: Medical dictionary
  3. Knee-jerk: Drug Medical Dictionary

Slang (1 matching dictionary)
  1. knee-jerk: Urban Dictionary

Definitions from Wiktionary (
)
American English Definition British English Definition
adjective:  Unthinking, not carefully considered, (nearly) automatic, spontaneous, easily predictable.
noun:  A sudden reflexive movement of the leg below the knee, as a reaction to a tap to the tendon just below the patella (kneecap).

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