black mark 
noun British informal
A note or record of a person’s misdemeanour or discreditable action: a black mark went down against his name for turning down the job...
- The gas company has now removed the black mark from your record and is sending you back the £34.72 as an apology.
- It will also discourage defaulters, who will fear black marks on their credit record.
- It's a big black mark against her administrative record.