You know what it looks like… but what is it called?
TAKE THE QUIZ“debt of”
The following 4 entries include the term debt of.
debt of honor
: a debt (as one incurred by betting or gambling) which is not recoverable by law but which the debtor is conventionally considered in honor bound to pay
debt of record
debt of gratitude
noun phrase: appreciation or thanks that someone should give another person
owe a debt of gratitude/thanks to
idiom: to have a good reason to be very grateful to (someone)
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Merriam-Webster unabridged