上あげ蓋ぶた

noun

trapdoor; removable floor board; lift-up lid

Refers to a hinged or removable cover set into a floor, ceiling, or countertop, often providing access to a space below. Common in traditional Japanese architecture and modern utility access panels.

See also: 上板

• 床ゆか下した収しゅう納のうの上あげ蓋ぶたを開あけて、掃そう除じ機きをしまった。

  I opened the trapdoor to the underfloor storage and put away the vacuum cleaner.

• カウンターの上あげ蓋ぶたを外はずすと、配はい管かんが見みえる。

  When you remove the counter's lift-up lid, you can see the plumbing.