叩けば埃が出る
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Meanings
1
everyone has flaws; scratch the surface and you'll find dirt
Proverb meaning that if you look closely enough at anyone or anything, you will find imperfections or hidden faults. Often used to remind people that nobody is perfect.
He looks perfect, but scratch the surface and you'll find dirt.
No matter how fine an organization is, if you look close enough you'll find flaws.