Definitions from Wiktionary (Knee jerk)

▸ adjective:  Alternative spelling of knee-jerk [Unthinking, not carefully considered, (nearly) automatic, spontaneous, easily predictable.]
▸ noun:  Alternative spelling of knee-jerk [A sudden reflexive movement of the leg below the knee, as a reaction to a tap to the tendon just below the patella (kneecap).]
▸ Also see knee_jerk


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