noun
living apart in the same house; separate lives under the same roof
Describes a married couple who remain legally married and live in the same house but lead emotionally and practically separate lives, often without communication or shared activities.
彼らは家庭内別居の状態がもう5年も続いている。
They have been living apart in the same house for five years now.
家
It seems more couples are choosing to live separate lives under the same roof.