swelt \ˈswelt\verb (-ed/-ing/-s) Etymology: Middle English swelten — more at swelter intransitive verb 1.dialect a.: die, perish b.: faint, swoon 2.dialect: to become oppressed by heat : swelter, suffocate transitive verb 1.dialect: to cause to die 2.dialect: to overpower with or as if with heat : broil, scorch