knee-jerk
Knee jerk. (Physiol.) Defn: 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.
Knee jerk. (Physiol.) Defn: 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.