Source : Webster's Revised Unabridged Dictionary (1913)

Swelt \Swelt\, v. t.
   To overpower, as with heat; to cause to faint; to swelter.
   [Obs. or Prov. Eng.] --Bp. Hall.

Swelt \Swelt\, obs.
   imp. of {Swell}.

Swelt \Swelt\, v. i. [OE. swelten to die, to swoon or faint, AS.
   sweltan to die; akin to OD. swelten to hunger, to fail, OS.
   sweltan to die, Icel. svelta to die, to hunger, Sw. sv["a]lta
   to hunger, Dan. sulte, Goth. sviltan to die. Cf. {Swelter},
   {Sweltry}.]
   1. To die; to perish. [Obs.]

   2. To faint; to swoon. [Obs.] --Chaucer.

            Night she swelt for passing joy.      --Spenser.