noun
summer cold; summer flu
Refers to a cold caught during the summer, often considered more stubborn than a winter cold.
See also: 風邪
今年の夏風邪はなかなか治らない。
This year's summer cold just won't go away.
冷房で夏風邪をひいた。
I caught a summer cold from the air conditioning.
風邪 is the general term for a cold, while 夏風邪 specifically refers to a cold caught in summer.
Compound of 夏 (summer) and 風邪 (cold).