tarnishes , tarnishing , tarnished
If you say that something tarnishes someone's reputation or image, you mean that it causes people to have a worse opinion of them than they would otherwise have had.
The affair could tarnish the reputation of the senator.
这一事件可能有损那位参议员的名声。
If a metal tarnishes or if something tarnishes it, it becomes stained and loses its brightness.
It never rusts or tarnishes.
它从不生锈,也没有污迹。