Source : Webster's Revised Unabridged Dictionary (1913)

Sweal \Sweal\, v. i. [imp. & p. p. {Swealed}; p. pr. & vb. n.
   {Swealing}.] [OE. swelen to burn, AS. swelan; akin to G.
   schwelen to burn slowly, schw["u]l sultry, Icel. sv[ae]la a
   thick smoke.]
   To melt and run down, as the tallow of a candle; to waste
   away without feeding the flame. [Written also {swale}.] --Sir
   W. Scott.