knee jerk
A "knee jerk reaction" refers to an automatic, unthinking response to a stimulus, often characterized by a lack of reflection or consideration.
Definition and Origin
The term "knee jerk reaction" originates from the patellar reflex, a physical reflex that occurs when the tendon below the kneecap is struck, causing the leg to kick out involuntarily. This reflex action is quick and does not involve conscious thought, which is why the term has been adopted figuratively to describe similar automatic responses in behavior and decision-making.
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