Proof of debt
Defined in 1 dictionary — Black's (1910)
Black's Law Dictionary
Henry Campbell Black, M.A. · 1910
The formal establishment by a creditor of his debt or claim, in some prescribed manner. (as, by his affidavit or otherwise,) as a preliminary to its allowance, along with others, against an estate or property to be divided, such as the estate of a bankrupt or insolvent, a deceased person, or a firm or company in liquidation.
Defined under Proof in Black's Law Dictionary.