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knee-jerk reflex

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Noun knee-jerk reflex has 1 sense
  1. knee jerk, knee-jerk reflex, patellar reflex - a reflex extension of the leg resulting from a sharp tap on the patellar tendon
    --1 is a kind of reflex, instinctive reflex, innate reflex, inborn reflex, unconditioned reflex, physiological reaction
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