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VERB
玷污，敗壞，損害(名譽或形象)
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.
例句
The affair could tarnish the reputation of the prime minister...
這一事件可能有損首相的名譽。
His image was tarnished by the savings and loan scandal.
他的形象因為那樁儲蓄信貸丑聞而受損。
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V-ERG
(使)有污跡;(使)失去光澤;(使)變暗淡
If a metal tarnishes or if something tarnishes it, it becomes stained and loses its brightness.
例句
It never rusts or tarnishes...
它從不生銹，也不會失去光澤。
Wear cotton gloves when cleaning silver, because the acid in your skin can tarnish the metal.
清潔銀器時要戴上棉手套，因為你皮膚里的酸性物質會使它失去光澤。
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N-UNCOUNT
銹斑;污點
Tarnish is a substance which forms of the surface of some metals and which stains them or causes them to lose their brightness.
例句
The tarnish lay thick on the inside of the ring.
戒指內側有一層厚厚的銹斑。