Bible Dictionaries
Knee Jerk
Webster's Dictionary
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.
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Bibliography Information
Webster, Noah. Entry for 'Knee Jerk'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​k/knee-jerk.html. 1828.