Knee jerk Meaning, Definition & Usage
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noun a reflex extension of the leg resulting from a sharp tap on the patellar tendon
patellar reflex; knee-jerk reflex.
WordNet
Definitions
(Physiol.) a jerk or kick produced by a blow or sudden strain upon the patellar tendon of the knee, which causes a sudden contraction of the quadriceps muscle; one of the so-called tendon reflexes.
