Blot your copybook meaning

What does the saying 'Blot your copybook' mean?

If you blot your copybook, you make a mistake or do something wrong that will negatively affect someone's opinion of you.

Country: International English | Subject Area: General | Usage Type: Both or All Words Used

Contributor: Richard Flynn

All idioms have been editorially reviewed, and submitted idioms may have been edited for correctness and completeness.

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