blot one's copy book
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English[edit]
Alternative forms[edit]
Pronunciation[edit]
Audio (General Australian): (file)
Verb[edit]
blot one's copy book (third-person singular simple present blots one's copy book, present participle blotting one's copy book, simple past and past participle blotted one's copy book)
- (idiomatic) To damage one's own reputation through bad behavior.