blot your copybook
成語所屬單字blot
blot your copybook — 慣用語
1. to act in a way that makes other people think less well of you
1.慣用語
釋義
做錯事而失分
to act in a way that makes other people think less well of you
例句
By lying about the test score, Ravi blotted his copybook at home.
The junior lawyer blotted her copybook by missing the judge's deadline.