上梁不正下梁歪

shàngliáng bù zhèng xiàliáng wāi

[those in subordinate positions will follow the example set by their superiors; fish begins to stink at the head; when the upper beam is not straight, the lower ones will go aslant] 比喻地位或声誉高的人品行不好, 下边的人也仿效而学坏