blot one's copy book

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English[edit]

Alternative forms[edit]

Pronunciation[edit]

  • (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)

  1. (idiomatic) to damage one's own reputation through bad behavior.