sharing a room; dormitory room
Refers to the act of sharing a room (e.g., in a hotel, dormitory, or lodging) or the room itself. Often used in travel and accommodation contexts.
On the school trip, I shared a room with a friend.
This hotel has cheap shared-room plans.
match between wrestlers from the same stable
Sumo term. A bout between two wrestlers belonging to the same stable, which is normally avoided in tournament scheduling.
A match between stablemates is not scheduled except in a championship playoff.
相部屋 is a shared room where multiple people stay together, the opposite of a private 個室.
Compound of 相 (ai, 'together') + 部屋 (heya, 'room'). The sumo sense extends the idea of 'same room' to 'same stable'.