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- DictionaryKnee-jerk/ˈnē ˌjərk/
adjective
- 1. (of a response) automatic and unthinking: "a knee-jerk reaction"
noun
- 1. a sudden involuntary reflex kick caused by a blow on the tendon just below the knee.
adjective
noun
The patellar reflex, also called the knee reflex or knee-jerk, is a stretch reflex which tests the L2, L3, and L4 segments of the spinal cord. Many animals, most significantly humans, have been seen to have the patellar reflex, including dogs, cats, horses, and other mammalian species. Wikipedia