sumo stable
A training and living facility where sumo wrestlers belong, managed by a stablemaster.
He trains hard every day at the sumo stable.
相撲部屋 is the full, unabbreviated term for a sumo stable, while 部屋 is the casual shortened form used in sumo contexts.
Compound of 相撲 (sumō, 'sumo') and 部屋 (heya, 'room'), referring to the communal training and living quarters of a sumo stable.