地ち下か１いっ階かいMeaningsNoun1. first basement floor; first floor underground; lower ground floorKanji used地ground下below階floor (of a building)Composed of地ち下かunderground; below the ground; world of the dead; the grave; underground (activities, movement, etc.); secret; illegal; in hidingNoun１いっ階かいfirst floor; ground floor; one floor; one storey; one rankNoun