“上梁不正下梁歪”用英语说是什么？

Fish begins to stink at the head.
上梁不正下梁歪

A crooked stick will have a crooked shadow.
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上梁不正下梁歪(即鱼要烂,头先臭) never offer to teach fish to swim.

If the upper beam is not straight, the lower ones will go aslant

上梁不正下梁歪
when the above behave wrongly,the below will do the same