Simple past tense and past participle of tarnish.(verb)
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Use "tarnished" in a sentence
"Amanda Knox will have her name tarnished for decades because there will always be a lingering doubt about her innocence or guilt in the minds of some."
""I don't need my name tarnished in this way, this is wrong.""
"Singh's ruling Congress party-led coalition government has seen its term tarnished by a string of corruption scams that have paralyzed parliament, led to the sacking of a minister, and eroded public confidence in the prime minister and his party."