Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “blot your copybook”

blot your copybook

UK
to do something that makes other people respect or trust you less: I really blotted my copybook by missing the meeting.Damaging reputationDisapproving and criticizing
(Definition of blot your copybook from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
Browse related topics

You are looking at an entry to do with Damaging reputation, but you might be interested in these topics from the Fame and reputation topic area:

Add Cambridge dictionaries to your browser to your website

Translations of “blot your copybook”

Word of the Day

knack

a skill or an ability to do something easily and well

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More