Meaning of 'Blot your copybook'
What does the saying 'Blot your copybook' mean?
Idiom: Blot your copybook
Meaning:
If you blot your copybook, you make a mistake or do something wrong that will negatively affect someone's opinion of you.
All idioms have been editorially reviewed. Submitted idioms may have been edited for correctness and completeness.
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