Etymology
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sweltering (adj.)

"oppressively hot" (of weather, seasons), 1590s, present-participle adjective from swelter (v.). Related: Swelteringly.

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Definitions of sweltering

sweltering (adj.)
excessively hot and humid or marked by sweating and faintness;
a sweltering room
sweltering athletes
Synonyms: sweltry
From wordnet.princeton.edu