knee jerk

Noun
  1. A reflex extension of the leg resulting from a sharp tap on the patellar tendon (synset 100866537)
    is a 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
    same as: knee-jerk reflex, patellar reflex

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