If going to university doesn't work out, students pay very little—if any—of their tuition fees back: you only start repaying when you are earning £21,000 a year.
2016年12月六级真题（第三套）阅读 Section C
柯林斯高阶英汉双解学习词典释义
VERB
偿还，偿付(贷款或债务)
If you repay a loan or a debt, you pay back the money that you owe to the person who you borrowed or took it from.