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]
(..) - And you're not anymore. Allow me a moment alone with Lord Baelish. Yes, father. And thank you, Lord Baelish. I'm forever in your debt. He seems pleased. Shouldn't he be? I assure you she's still a virgin. Tyrion never consumated the marriage. By the law of the land, she's no man's wife. (..)2015 TvShow: Game of Thrones Title: High Sparrow Season: 5 Episode 3