Describing someone who is prudish, strict about morality, or judgmental about others' behavior, especially regarding sexual or social conduct.
From 'bluenose,' originally a term for Nova Scotians (possibly from a potato variety or blue-nosed potatoes from that region), which evolved to mean a puritanical person. The term emerged in North America in the 19th century with its moral connotation by the 1880s.
This word shows how geographic nicknames can transform into personality judgments—Nova Scotians got called bluenoses for practical reasons (their potatoes or appearance), but over time 'bluenose' became shorthand for being uptight about morality, and now it survives mainly in that judgmental sense rather than its original geographic meaning.
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