bloodletting
/ˈblʌdˌletɪŋ/noun
mass noun
1- chiefly historical the surgical removal of some of a patient's blood for therapeutic purposes〈主史〉放血（术）。
1.1
- the violent killing and wounding of people during a war or conflict杀戮, 血洗：
gang members have halted their internecine bloodletting.
匪帮内部已经停止了两败俱伤的流血冲突。
1.2
- bitter division and quarrelling within an organization内讧。