For-swelan

According to the Old English Dictionary:

for-swelan

p. -swæl, pl. -swǽlon; pp. -swolen [swelan to burn] To burn up, kindle; combūri :-- Hit fǽringa fýre byrneþ, forsweleþ under sunnan it suddenly burns with fire, kindles under the sun, Exon. 63 b; Th. 233, 29; Ph. 532. for-swelan