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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From blue + bottle, after the resemblance to shiny colored-glass bottles. In sense 3 (“cornflower”), via Middle English blewbothel. Sense 6 (“police officer”) is in reference to the colour of the uniform.
cornflower, bachelor's button, Centaurea cyanus
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Classic usage
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