the action of paying someone too much or an amount paid that is too much

She did not notice that she had received a salary overpayment. 她未曾发现自己拿到了超额工资。

The governemnt must try to prevent $1.8 million in overpayment of benefits per year. 政府必须力图避免每年超额付出的一百八十万美元的福利。