Meaning

verb increase in size, magnitude, number, or intensity

verb become filled with pride, arrogance, or anger

verb expand abnormally

originFrom Middle English swollen, i-swolle, y-swolle, yswolle, ȝeswollen, from Old English swollen, ġeswollen, from Proto-Germanic *swullanaz, past participle of Proto-Germanic *swellaną (“to swell”). Cognate with West Frisian swollen (“swollen”), Dutch gezwollen (“swollen”), German geschwollen (“swollen”), Swedish svullen (“swollen”).

Etymology from Wiktionary, CC BY-SA 3.0