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noun Knee jerk n. (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.
Knee jerk n. Emotional and predictable; of certain people and their reactions to events.
Collaborative International Dictionary of English 0.48
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