noun
business holiday; day off for a business
Refers to a day when a business or establishment is closed, such as a regular closing day or a special holiday.
この店の休業日は毎週火曜日です。
This shop's business holiday is every Tuesday.
年末年始は休業日となります。
We will be closed for the year-end and New Year holidays.
休日 is a general holiday or day off, not limited to businesses; 休業日 is specifically for business closures.
Compound of 休業 (kyūgyō, 'business closure') + 日 (bi, 'day').