7 letters · 10 points in Scrabble
verb be uncomfortably hot
verb suffer from intense heat
originFrom Middle English swelteren, frequentative form of Middle English swelten (“to die; faint”), from Old English sweltan (“to die”), from Proto-West Germanic *sweltan, from Proto-Germanic *sweltaną (“to die”), from Proto-Indo-European *swel- (“to smolder; burn”), equivalent to swelt + -er (frequentative suffix).
Etymology from Wiktionary, CC BY-SA 3.0