一いち枚まい下した

noun

just beneath; directly under; one step below

Used for a place, area, or surface that is immediately below something else, or for being one rank/step lower in a hierarchy or comparison.

• この床ゆかの一いち枚まい下したには地ち下か室しつがある。

  There is a basement just beneath this floor.

• 彼かれの実じつ力りょくはプロの一いち枚まい下しただ。

  His ability is one step below professional level.