noun, noun or participle which takes 'suru', intransitive verb
summer fatigue; suffering from summer heat
Refers to the tiredness, loss of appetite, and general unwellness caused by the summer heat. Often used as a noun or with する to describe the condition.
今年は特に夏負けがひどい。
This year I'm suffering especially badly from the summer heat.
暑さで夏負けして、食欲がない。
I'm suffering from summer fatigue because of the heat and have no appetite.