swelters

/S W EH1 L T ER0 Z/
noun
  1. 1

    Intense heat.

    โ€œThe summer swelter did not relent until late in September, most years.โ€

verb
  1. 1

    To suffer terribly from intense heat.

  2. 2

    To perspire greatly from heat.

  3. 3

    To cause to faint, to overpower, as with heat.

Source: https://en.wiktionary.org/wiki/swelter, https://en.wiktionary.org/wiki/swelters