Blot your copybook

usgb
verb phrase

To make a mistake or behave badly, which ruins your reputation or your relationship with other people.

He blotted his copybook when he was caught stealing in the office.
Visual representation of "blot your copybook" - To make a mistake or behave badly, which ruins your reputation or your relationship with other people

Often appears as...

  • to blot one's copybook
  • have your copybook blotted

Usage tips

Idiomatic

Definition 1 of 1
Visual representation of "blot your copybook"
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British Origins

This is a British phrase not commonly used in American English, so it might confuse US speakers.

Illustration for British Origins
When I said he blotted his copybook, my American friend had no idea what I meant.
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Not Literal

The phrase is metaphorical and doesn't involve actual ink or books; it's about reputation.

Illustration for Not Literal
After the scandal, the politician had really blotted his copybook.
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Social Context

Mostly used in social or professional contexts where trust and behavior are important.

Illustration for Social Context
She blotted her copybook with the team after lying about the project's progress.
Visual representation of the word "Blot your copybook"

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