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 ?
As the fiancee of Hewitt, she is virtually an adopted Aussie and she was not going to blot her copy book by getting involved in a row.
She does not blot her copy book by lashing out, preferring instead to heap plaudits on those with whom she established a rapport and to dismiss others as obstructionist and uninformed.