blot (one's) copy book

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blot (one's) copy book

To tarnish, damage, or ruin one's reputation by behaving badly or committing some mistake or social transgression. Refers to a child's copy book, the blotting (staining with ink) of which ruins one's work. Primarily heard in UK. The local councilor blotted his copy book when it came to light that he had accepted bribes to allow unregulated development projects to go ahead. I really blotted my copy book when I spilled my drink on the visiting dignitary last night.
See also: blot, book, copy
References in periodicals archive ?
The Arctic Monkeys, Natasha Bedingfield, Bloc Party, Hard-Fi, Kaiser Chiefs and Maximo Park will try not to blot their copy books in 2007.
Because of the rise of dotcoms, a lot more people are willing to take risks and possibly to blot their copy books with start-up businesses -- and that's the way new industries get started," he said.