to have a shadow (on one's past), to have a blot on one's record
Einen Makel in der Vergangenheit oder eine dunkle Seite in der Biografie haben.
To have a dark spot in one's past or a flaw in one's reputation.
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In seiner Biografie scheint er einen Schatten zu haben.— It seems he has a shadow in his biography.
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Trotz seines Erfolgs wird er immer einen Schatten haben.— Despite his success, he will always have a shadow.