See tarnish in Webster's New World Roget's A-Z Thesaurus II
verb
To spoil the soundness or perfection of:
blemish, damage, detract from, disserve, flaw, harm, hurt, impair, injure, mar, prejudice, vitiate. See better, helpTo contaminate the reputation of:
befoul, besmear, besmirch, bespatter, blacken, cloud, denigrate, dirty, smear, smudge, smut, soil, spatter, stain, sully, taint. Idioms: give a black eye to, sling (or throw) mud on. See attack, clean
noun
A mark of discredit or disgrace:
black eye, blemish, blot, onus, spot, stain, stigma, taint. (Archaic) attaint. Idiom: a blot on one's escutcheon. See marks, respect
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