Definition of black mark noun from the Oxford Advanced Learner's Dictionary

 

black mark

 noun
noun
BrE
 
; NAmE
 
(British English)
 
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a note, either in writing on an official record, or in somebody’s mind, of something you have done or said that makes people think badly of you She earned a black mark for opposing company policy. The public scandal was a black mark against him.
See the Oxford Advanced American Dictionary entry: black mark