休館日（きゅうかんび、kyuukanbi）
- closing day

The Japanese word 休館日 (きゅうかんび) refers to a "closed day," "day off," or "holiday" for a public facility, such as a museum, library, art gallery, or swimming pool. It signifies a day when the facility is not open to the public. The term is typically used for facilities that have regular operating hours and scheduled days off. It's similar to the English phrase "closed on Mondays" or "closed for maintenance."

⚫︎ 美術館は月曜日は休館日です。 Translation: The art museum is closed on Mondays. ⚫︎ 図書館の休館日は年末年始です。 Translation: The library's holidays are during the year-end and New Year period. ⚫︎ プールの休館日を確認してください。 Translation: Please check the pool's closed days.

You can use 休館日 when you want to inquire about the days a facility is closed, to state that a facility is not open, or to inform someone about the days a place is closed. It's important to know the [休館日] before visiting a facility to avoid disappointment. You will commonly find this word on websites, signboards, or schedules of cultural and recreational facilities.

⚫︎ The word is typically written with the kanji 休 (kyuu - rest, absence), 館 (kan - building, hall, facility), and 日 (bi/nichi - day). ⚫︎ The reading is きゅうかんび in hiragana. ⚫︎ There are no other standard ways to write this word. The okurigana (hiragana attached to kanji) is fixed.

There aren't direct synonyms but similar concepts can be expressed with: ⚫︎ 定休日 (teikyuubi) - regular holiday/day off (for shops, restaurants, etc.) ⚫︎ 閉館日 (heikannbi) - closing day (less common, but can also refer to a facility being closed).

⚫︎ 開館日 (kaikanbi) - open day, day the facility is open. ⚫︎ 営業日 (eigyōbi) - business day, operational day.

今週の科学博物館の休館日は火曜日です。 ・Translation: This week, the science museum's closed day is Tuesday. ・Explanation: This sentence tells us the specific day the science museum is closed.

休館日なので、今日はその美術館には行けません。 ・Translation: Because it's a closed day, I can't go to that art museum today. ・Explanation: The speaker is stating that they cannot visit the art museum because it is closed.

The word 休館日 is formed by combining the kanji 休 (kyuu - rest, absence) with 館 (kan - building, hall, facility), and 日 (bi/nichi - day). It literally translates to "rest building day," indicating a day the facility rests or is closed to the public.