One of the mysteries of the English language finally explained.
1Regional rare The rear part of a house, or a subsidiary building situated to the rear of the main premises of a house, especially one used for a specific purpose, as a wash house, storage space, etc. Chiefly regional in later use (now rare).
2North American North American. A small building or room containing a toilet, especially one which is behind or outside a main building.
Mid 16th century. From back- + house.
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