反其道而行 [－－－－－]

Jyutping faan2 kei4 dou6 ji4 hang4
Pinyin fǎn qí dào ér xíng

Definitions (粵典–words.hk)
  1. 語句
    用​同常態​相反​嘅​方式​去​做
    in the way opposite to the norm