blot your copybook Meaning in Cambridge English Dictionary
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Meaning of "blot your copybook" - English Dictionary

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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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