The story
- Old English · inherited fromforswǣlan“to burn, burn up, inflame, consume”
- Middle English · inherited fromforswelen
- English todayforsweal
From Middle English forswelen, forswælen, from Old English forswǣlan (“to burn, burn up, inflame, consume”), equivalent to for- + sweal.
Etymology from Wiktionary, CC BY-SA 4.0.