black mark
noun [ C usually singular ] informal uk/ˌblæk ˈmɑːk/ us/ˌblæk ˈmɑːrk/
污点；不足之处
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. 如果我上班再次迟到，那将是我的又一个污点。