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English definition of “tarnish”

tarnish

verb     /ˈtɑːnɪʃ/
SOMEONE [T] to spoil the way in which people think of someone so that they do not respect them: to tarnish someone's image/reputation Damaging reputationDisapproving and criticizing
METAL [I, T] If a metal tarnishes or something tarnishes it, it becomes less bright and shiny.Metals and metalworkingChemical elements
(Definition of tarnish verb from the Cambridge Learner's Dictionary © Cambridge University Press)

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