How to say to pay back in full/to redeem a debt in Chinese 还清

把账还清了。 ( Pay off the bill. )

他已许诺如期还清债款。 ( He has promised to pay off the debt as scheduled. )

外债基本还清。 ( The foreign debt was basically paid off. )

所欠金额必须在一年内还清。 ( The amount owed must be repaid within one year. )