“have feet of clay”别理解成“脚上有泥土”，真实含义是有潜藏对策严重缺；品格上有缺陷（或弱点）。

【例句】
When those idols are found to have feet of clay, the pain of disenchantment can be profound.
当人们发现那些偶像品格上有缺陷时，会产生无比痛苦的失落感。

I know it's hard to believe, but anyone you admire surely has feet of clay.
我知道这很难让人相信，但凡你欣赏的人，肯定都有不为人知的缺点。