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]
(..) You're amazing. You're-- You're wonderful. You're... a little unorthodox I'll admit. But thy deed is great, and thine heart is pure. - I am eternally in your debt. - And where would a brave knight be without his noble steed? I hope you heard that. She called me (..)2001 Shrek