Definition of knee jerk

Definition of knee jerk
  1. knee jerk Adjective Alternative spelling of knee-jerk
  2. knee jerk Noun Alternative spelling of knee-jerk
  3. knee-jerk Adjective Automatic, spontaneous, easily predictable
  4. knee-jerk 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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