tarnished
v.
（通常指金属）（使）失去光泽，（使）变灰暗( tarnish的过去式和过去分词 );
玷污，败坏;
例句:
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The enamel gives new brass an authentically tarnished finish.
用瓷釉作末道漆使新的黄铜器看似自然地失去了光泽。
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Accusations of tax evasion have tarnished his clean image.
避税的指控使他的清白形象蒙污。
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He says he wants to improve the tarnished image of his country.
他说他想改善自己国家受损的形象。
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The case has also badly tarnished India's image abroad.
来自BBC
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Ties to terrorism tarnished Gadhafi's international image.
来自VOA
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Now her image was steadily being tarnished.
来自NEWYORKER