noun
dressing room; green room; backstage
Refers to the area behind the stage in a theater, including dressing rooms and the backstage space where performers prepare.
楽屋裏で役者が台詞を確認している。
The actors are checking their lines backstage.
noun
inside story; behind-the-scenes details; hidden circumstances
Figurative use: the private, unpublicized side of a situation, similar to 内情 or 内幕.
その事件の楽屋裏を取材した。
I investigated the inside story of that incident.