离群索居（離羣索居）　

◎ 离群索居 líqún-suǒjū

(1) [live in solitude; keep oneself to oneself; live out of the world;live alone; live within oneself; plough a lonely furrow] 索居:单独居住。离开朋友独自生活

学者离群索居,各为异说。——《隋书·经籍志一》

(2) 亦称“离群索影”