叩阍 kòuhūn
[knock at official's gate to lodge complaint;go to the royal court to complain about one's wrong] 扣击宫门,指官吏、百姓到朝廷诉冤
阍,皇宫门。叩阍指吏民趋宫门陈诉冤屈。 《资治通鉴.卷二五八.唐纪七十四.昭宗大顺元年》:「不然,方且轻骑叩阍.顿首丹陛,诉奸回于陛下之扆坐,纳制敕于先帝之庙庭。」