divide and rule; divide and conquer
A political or military strategy of maintaining control by breaking up larger concentrations of power into smaller, more manageable groups. Often used in historical and geopolitical contexts.
The empire ruled its colonies using a policy of divide and rule.
分割統治は、敵対する勢力を互いに争わせることで支配を容易にする。
Divide and conquer makes control easier by setting opposing forces against each other.