GNU Collaborative International Dictionary of English

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Found 2 definitions 

  1.       

    Knee jerk. (Physiol.) A jerk or forward kick of the lower part of the leg produced by a blow or sudden strain upon the patellar tendon of the knee, which causes a sudden contraction of the quadriceps muscle; the patellar reflex.
    Webster 1913 Suppl.
    
      
    
  2.       

    Knee jerk, n. emotional and predictable; -- of certain people and their reactions to events.
    PJC

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