rendered ineffective or powerless because subordinates have become too strong to be managed

封建王朝末期，地方势力往往尾大不掉，严重威胁中央集权。

bottom-heavy or cumbersome because a subordinate part is disproportionately large or powerful

由于部门设置过于冗杂，这家公司的机构显得尾大不掉。