feud
/fju:d; fjud/ n long and bitter quarrel between two people, families or groups （两人、 家族或团体间的）长期不和, 世仇
a long-standing feud 夙怨
Because of a family feud, he never spoke to his wife's parents for years. 由於两家不和, 他已多年不与岳父母说话. feud, v [I, Ipr]
~ (with sb/sth) carry on a feud 长期争斗; 结世仇
feuding neighbours 长期不睦的邻居
The two tribes are always feuding (with each other). 这两个部落一直争斗不休.