noun, noun or participle which takes 'suru', intransitive verb
summer slump; summer lull
Refers to a seasonal decline in business, activity, or energy during the summer, often due to heat or holidays.
夏枯れで売り上げが落ちた。
Sales dropped due to the summer slump.
この業界は毎年夏枯れする。
This industry experiences a summer lull every year.