noun
a state of oppressive heat
verb
to suffer, sweat, or be faint from heat
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The workers sweltered in the heat as they labored under the sun.
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I can't stand this sweltering weather, it's too hot!
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I'm sweltering like crazy in this heat, it's unbearable.
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The tension in the room was so thick, you could almost feel it sweltering around us.