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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 Learner's Dictionary & Thesaurus © Cambridge University Press)

Translations of “blot your copybook”

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