The photographer has acknowledged a/his 'debt' to Andy Warhol. [=the photographer has said that his work was influenced by the photographs made by Andy Warhol]
banks with millions of dollars of 'bad debt' [=banks that have loaned millions of dollars that will not be repaid]
She's finally paid off her mortgage 'debt'. [=the money that she owed the bank to pay for her house]
(..) - Am I not kinder? Yes. These two were captured leading an ambush on one of our supply trains. Your son? Handsome. Obviously a debt owed to your mother. There was a time I would have lost my heart to a face like yours. And you, no doubt, would have broken it. Ian, no! You would kill your queen? (..)2012 Snow White and the Huntsman