跳はね上あげ戸ど

noun

trapdoor; flap door

A door that opens by flipping upward, often hinged at the top or bottom; used for attic access, cellar entrances, or small service hatches.

• 屋や根ね裏うらへ上あがるには、天てん井じょうの跳はね上あげ戸どを押おし上あげます。

  To go up to the attic, push up the trapdoor in the ceiling.

• 床ゆかに跳はね上あげ戸どがあって、地ち下か室しつに降おりられる。

  There is a trapdoor in the floor that leads down to the basement.