Word Origin & History
swelterc.1403, frequentative of swelten "be faint (especially with heat)," c.1386, from O.E. sweltan "to die," from P.Gmc. *swel- (cf. O.S. sweltan "to die," O.N. svelta "to put to death, starve," Goth. sviltan "to die"), originally "to burn slowly," hence "to be overcome with heat or fever;" also the source
of O.E. swelan "to burn," from PIE base *swel- "to shine, burn" (see
Selene). For specialization of words meaning "to die," cf.
starve.