the policy of maintaining control over one's subordinates or subjects by encouraging dissent between them, thereby preventing them from uniting to overthrow one
分而治之
the politics of divide and rule in society.
對社會實行分而治之的政治。
(of a group which should be coherent) split by factional interests
（本該一致的團體因不同派系利益而）分裂的
the regime is profoundly divided against itself.
該政權(quán)四分五裂。