blot your copybook definition, meaning - what is blot your copybook in the British English Dictionary & Thesaurus - Cambridge Dictionaries Online

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English definition of “blot your copybook”

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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.
Translations of “blot your copybook”
in Chinese (Traditional) 玷污自己的名聲…
in Chinese (Simplified) 玷污自己的名声…
(Definition of blot your copybook from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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