burn

Picture two very different Old English words arriving at the same modern spelling: one crackling with fire, the other bubbling up as a spring. The burning sense traveled through Old Norse brinna and brenna, while the water sense was Old English burne or burna, “fountain”—a linguistic collision as odd as calling both a flame and a brook “hot stuff.” The fire family may ultimately connect with the reconstructed Indo-European stem *bʰrenw-, associated with boiling, and Wiktionary notes that burn is a doublet of brew: both suggest liquid seething in a pot before English separated the flames from the kettle. By the early 12th century, burn could describe being consumed by fire; centuries later it acquired figurative heat, from burning desire to a verbal “burn” meaning to humiliate someone. That modern insult is beautifully literal: a sharp joke leaves the social skin feeling scorched.