屋おく上じょう屋おくを架かす

expression, godan verb (-su)

do something useless; gild the lily; build a roof atop the roof

Idiomatic expression meaning to do something redundant or unnecessary, like adding a roof on top of an existing roof. Often used to criticize superfluous effort.

See also: 屋上架屋

• この報ほう告こく書しょにさらにデータを追つい加かするのは屋おく上じょう屋おくを架かすようなものだ。

  Adding more data to this report would be like gilding the lily.

• 彼かれの提てい案あんは屋おく上じょう屋おくを架かすだけで、何なんの役やくにも立たたない。

  His suggestion is just building a roof atop the roof; it serves no purpose.