This is the 7664th most frequent Chinese word.
还债
To repay a debt.
In this sentence, '还债' is used in its literal sense, referring to the repayment of monetary debt.
他努力工作，就是为了尽快还债。
He works hard just to repay his debt as quickly as possible.
Here, '还债' is used literally but highlights moral or ethical qualities of the individual undertaking the repayment.
帮助朋友还债是他的品德体现。
Helping a friend repay their debt showcases his virtue.
In this context, '还债' is used metaphorically, representing the act of reciprocating or fulfilling trust rather than a financial obligation.