infighting
noun [ U ] uk/ˈɪnˌfaɪ.tɪŋ/ us/ˈɪnˌfaɪ.t̬ɪŋ/
（集团内部的）暗斗
competition between people within a group, especially to improve their own position or to get agreement for their ideas
political infighting 政治暗斗
Years of infighting among the leaders have destroyed the party. 领导人之间长期的勾心斗角毁掉了整个政党。