1.
women's quarters in Edo Castle
The inner chambers of Edo Castle where the shogun's wife, concubines, and their female attendants lived during the Edo period. By extension, also used to refer to any secretive inner circle dominated by women.
大奥は男子禁制だった。
The inner chambers were off-limits to men.
Cultural note
The 大奥 was the private living quarters within Edo Castle exclusively for women, including the shogun's wife (御台所), concubines (側室), and numerous female attendants. It was strictly forbidden for men to enter. The 大奥 is a popular subject in Japanese historical dramas, manga, and novels.