Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Origin: swelt 'to die, become unconscious because of heat' (11-20 centuries), from Old English sweltan 'to die'

swelter

 verb
     
swel‧ter [intransitive]
to feel extremely hot and uncomfortable:
Crowds of shoppers sweltered in the summer heat.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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