反其道而行之

fǎnqídàoérxíngzhī
  1. to do the very opposite
  2. to act in a diametrically opposite way

CEDICT

to do just the opposite; to act in a diametrically opposite way

Wiktionary

Entry Composition

1 反其道而行 fǎnqídàoérxíng to do just the opposite; to act in a diametrically opposite way
2 之 zhī
  1. (possessive particle, literary equivalent of 的 de)
  2. him
  3. her
  4. it