Swelter (verb)

1. To suffer from intense heat and humidity.
2. To be in a state of discomfort or oppression from heat.

Origin:

From the middle english word "swelten", from the old english "sweltan" meaning "to die, perish".

Examples:

1. We sweltered through the hottest summer on record.
2. The city was sweltering under a heat wave.
3. The passengers sweltered in the non-air-conditioned train.
4. She sweltered in the sauna for an hour.
5. He sweltered under the bright lights during his stage performance.