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black mark

noun [C usually singular]
 
 
informal

Definition

the fact of people noticing and remembering something that you have done wrong or failed to do: If I'm late for work again, it will be another black mark against me.Faults and mistakesDamaging reputationDisapproving and criticizing
(Definition of black mark noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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