noun
regular holiday; fixed day off; regular closing day
Abbreviation of 定休日. Used for a business's scheduled weekly closing day or a regular day off.
See also: 定休日 (ていきゅうび)
この店の定休は毎週火曜日です。
This shop's regular closing day is every Tuesday.
美容院の定休を確認してから行きましょう。
Let's check the salon's fixed day off before going.