1. (冲突、战争、争吵)内部的，内讧的，自相残杀的
An internecine conflict, war, or quarrel is one which takes place between opposing groups within a country or organization.

1. characterized by bloodshed and carnage for both sides

e.g. internecine war

2. (of conflict) within a group or organization

e.g. an internecine feud among proxy holders