tarnishing
['tɑ:nɪʃɪŋ]
n.
（印花）白地沾色;
v.
（通常指金属）（使）失去光泽，（使）变灰暗( tarnish的现在分词 );
玷污，败坏;
例句:
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The causes of tarnishing gold and silver - plated connectors were studied respectively.
分别探讨了接插件镀金和镀银层变色的原因.
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Bright tin electrodeposits on copper wire are susceptible to tarnishing.
铜线材经光亮镀锡后易产生腐蚀变色.
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Do they not realize their foolhardiness and which they are tarnishing the Republic's image?
他们难道不知道自己的行为不但愚蠢,也会损害新加坡的形象?
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She said Russia risks further tarnishing its reputation as an energy supplier.
来自VOA
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Please stop tarnishing your reputation .
来自SA
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The revelations will prove deeply embarrassing to Cuadrilla and risks tarnishing its reputation further.
来自THETIMES