to find fault with someone, to find nothing good in someone
Nur das Negative an einer Person sehen und sie ständig kritisieren.
To constantly criticize someone, noticing only their flaws.
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Der neue Chef lässt kein gutes Haar an seinem Team.— The new boss finds fault with every single thing his team does.
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Warum kannst du nicht kein gutes Haar an ihm lassen?— Why can't you find anything good in him?