blot your copybook
US /blɑt yər ˈkɑp.i.bʊk/
UK /blɑt yər ˈkɑp.i.bʊk/
1.
玷污名声, 弄糟记录
to do something that spoils your good reputation or record
:
•
He was a promising student, but he blotted his copybook by cheating on the final exam.
他曾是一名很有前途的学生，但他因期末考试作弊而玷污了自己的名声。
•
One mistake could blot your copybook for years to come.
一个错误可能会在未来几年玷污你的名声。