sweal

From Middle English swelen, from Old English swelan (“to burn, be burnt up, inflame”) (compare Old English swǣlan (“to burn”)), from Proto-West Germanic *swelan, from Proto-Germanic *swelaną (“to smoulder, burn slowly, create a burningly cold sensation”), from Proto-Indo-European *swel- (“to shine, warm, smoulder, burn”). Cognate with Dutch zwelen (“to smoulder”), Low German swelen (“to smoulder”), German schwelen (“to smoulder”), Icelandic svala (“to cool”). Related to swelter.

sweal (third-person singular simple present sweals, present participle swealing, simple past and past participle swealed)

(intransitive) To burn slowly.
(intransitive) To melt and run down, as the tallow of a candle; waste away without feeding the flame.
- 1816, Jedadiah Cleishbotham [pseudonym; Walter Scott], chapter V, in Tales of My Landlord, […], volume II (Old Mortality), Edinburgh: […] [James Ballantyne and Co.] for William Blackwood, […]; London: John Murray, […], →OCLC, page 104:
  [M]ind ye dinna let the candle sweal as ye gang alang the wainscot parlour, and haud a' the house scouring to get out the grease again.
(transitive) To singe; scorch; dress (as a hog) with burning or singeing.
(transitive, dialectal) To consume with fire; burn.
(transitive, dialectal) To make disappear; cause to waste away; diminish; reduce.
- 1913, D[avid] H[erbert] Lawrence, “Baxter Dawes”, in Sons and Lovers, London: Duckworth & Co. […], →OCLC, part II, page 377:
  "He thinks it's only a tumour!" cried Annie to her mother. "And he can sweal it away."