颠倒是非
Stand truth on its head.
Confound right with wrong.
Turn things upside down.

eg：To say black is white is to stand truth on its head.

中英俚语俗语来源：韩愈·施先生墓铭：“笺注纷罗，颠倒是非。”

反义词：拨乱反正 Set things right side up.