旧きゅう債さいきゅうさいMeanings1nounold debt; past debtRefers to a debt that was incurred in the past and remains unpaid. Often used in financial or legal contexts.会かい社しゃは旧きゅう債さいの返へん済さいに苦くるしんでいる。The company is struggling to repay its old debts.