One of the mysteries of the English language finally explained.
1Bearing or flying a red flag; specifically bearing a red flag as a symbol of revolution, socialism, or communism.
2Chiefly North American. Identified (sometimes with a red flag or marker) as a cause for concern or as warranting special attention.
Late 19th century; earliest use found in Mary Braddon (1835–1915), novelist. From red + flagged, after red flag.
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