上あげ床ゆか

noun

raised floor

A floor built higher than the surrounding ground or another floor level, often seen in traditional Japanese architecture, stages, or storage areas.

• この部屋へやは上あげ床ゆかになっていて、畳たたみの下したに収しゅう納のうがあります。

  This room has a raised floor, and there is storage under the tatami mats.