to pay someone too much

I felt I should tell my boss she'd overpaid me by $50. 我觉得我应该告诉老板，她多付了我50美元。

disapproving Bankers are grossly overpaid for what they do. 银行家们报酬拿得太高了。

to pay more than originally agreed when paying back a loan, in order to reduce the cost of the loan

If you budget to overpay your mortgage on a regular basis, you can save a lot of money. 如果你能做好预算经常性的超额偿付按揭贷款，你能省下很多钱。