Grammar Girl: For Writers and Language Lovers. The political, royal and obscene meanings of blue. The differences in ‘plumb’ and plum.’
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Oct 14, 2025 Discover the intriguing origins of blue idioms, from the political history of 'blue states' to the medical link behind being 'blue in the face.' Uncover the value of 'blue chip' stocks and the fascinating tale behind the 'blue plate special.' Delve into the royal associations of blue and its transition to signify the obscene in humor. Learn the difference between 'plumb' and 'plum,' exploring their unique origins and meanings. Plus, enjoy a humorous listener-favorite familect story!
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Medical Explanations For 'Blue Blood'
- Medical conditions and pale skin may also explain the 'blue blood' image.
- Disorders like argyria and methemoglobinemia produced slate-gray or bluish skin linked to elites in history.
The Two Definitions Of A Blue Moon
- 'Once in a blue moon' originally meant impossible and evolved to mean rare by the 19th century.
- Astronomers now define blue moon two ways: a fourth seasonal full moon or a second full moon in a month.
Why 'Blue' Can Mean Obscene
- 'Blue' has meant obscene since the early 1800s, giving us terms like 'blue movie' and 'blue humor.'
- The exact origin is unclear but may relate to blue gowns or blue-covered French books.
