knee-jerk reflex

Definitions of knee-jerk reflex
  1. noun
    a reflex extension of the leg resulting from a sharp tap on the patellar tendon
    synonyms: knee jerk, patellar reflex
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    type of:
    inborn reflex, innate reflex, instinctive reflex, physiological reaction, reflex, reflex action, reflex response, unconditioned reflex
    an automatic instinctive unlearned reaction to a stimulus
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