I often use the word swell as an adverb meaning "excellent". That comes from a now-archaic adjective meaning "stylish" which was first attested in 1810 (use of it as a single positive expression is from 1930s American slang). That in turn is from a noun meaning "stylish person", which comes from the verb for "enlarge" because stylish people were thought to have swollen egos. Through Middle English swellen and Old English swellan, the verb traces to the Proto-Germanic word swellana, which is thought to derive from an unknown Proto-Indo-European root. Use of swell in a figurative manner (such as to swell with pride or swell with anger) began in the late 1300s, and usage of the word swell over time has been decreasing since a swell in the eighteenth century.
Hello! I'm Adam Aleksic. This year, I graduated from Harvard University with a degree in Government and Linguistics. There, I co-founded the Harvard Undergraduate Linguistics Society and wrote a thesis on Serbo-Croatian language policy, magna cum laude. In addition to etymology, I also really enjoy philosophy, trivia, vexillology, geography, board games, conlanging, art history, and law.