Meanings
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1
verb
to suffer or feel extremely uncomfortable because of intense heat
Passengers began to swelter inside the crowded bus.
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2
noun
a period or condition of oppressive heat
The afternoon swelter drove everyone indoors.
Thesaurus
Etymology
From Middle English swelteren, a frequentative of swelten, 'to die or faint,' from Old English sweltan and a Germanic verb meaning 'die.' The heat sense developed through the idea of being overcome or made faint by burning heat; the distant Indo-European root meant 'smolder or burn.'