knee jerk
knee·jerk
noun
Origin
From knee + jerk, First attested c. 1876, and derived from a figurative sense of the patellar reflex.
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Broader terms
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.