叩马而谏

Explanation: Reined horse for advice. Described as trying to remonstrate. 　　Source: "Bo Historical Biography," West died, King Wu _set_ Muzhu, No. King Wen, the East attacked Zhou. Bo, Shu Ch'i knocking horse and admonished said 'do not bury Fusi ruling Article and arms, indeed almost filial piety? Chen regicide to be described almost benevolence? 'To the left and right. Grandfather said, 'The righteous person. 'The Rotary away. "