Dictionary  knee' jerk"a reflex extension of the leg, caused by contraction of the quadriceps, resulting from a sharp tap on the patellar tendon; patellar reflex. knee-jerkPronunciation: (nē'jûrk"), [key] —adj. 1. of or pertaining to a knee-jerk. 2. Informal.reacting according to a certain habitual manner; unthinking: a knee-jerk liberal. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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