the tail wagging the dog
小事煩擾大事
口語·批評主次顛倒
英文釋義
when a small or secondary part of something dominates or controls the whole
例句
Letting one intern decide the policy is the tail wagging the dog.
典故來源
源自19世紀(jì)比喻，尾巴搖狗指次要部分控制整體。