屋上屋を架す おくじょうおくをかす Meanings Expression, Godan verb to do something useless; to gild the lily; to gild refined gold (literally: to build a roof atop the roof) See also: 屋上架屋 (おくじょうかおく). Kanji 屋 shop. Read as オク. 上 up. Read as ジョウ. 架 frame Word lists Idioms Jinuma: Japanese Dictionary · Word lists