自相殘害 [－－残－]

Jyutping zi6 soeng1 caan4 hoi6
Pinyin zì xiāng cán hài

Definitions (Wiktionary)
  1. phrase, idiomatic
    to slaughter each other; to massacre one another
    (syn.) 自相残杀, 自相殘殺
  2. phrase, idiomatic
    to bring about mutual harm