【偷梁换柱】〖tu liáng huàn zhù〗[steal the beams and pillars and replace them with rotten timbers; resort to fraudulence; secretly replace the beams and pillars with rotten timbers; steal the beams and change the pillars -- to perpetrate a fraud]

偷天妙手吞国营，

梁上君子窃权柄。

换柳移花富代表，

柱石阶级工农兵。

比喻暗中玩弄手法，以假代真，以劣代优。Metaphor  on sly play with technique, use false replace really, use inferior replace high quality. 同：偷天换日、以假乱真。反：光明磊落。谜：木贼。