blot (one's) copy book

(redirected from blot his copy book)

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 ?
Tommy Smith scored for Derby on 17 minutes but Lee McCulloch equalised moments later - only to blot his copy book with a late red card.
Young did blot his copy book slightly by being sin-binned for punching, along with Edinburgh's Martin Leslie midway through the second-half.
Having been sent off some dozen times during his club career that saw him perform in the colours of Wimbledon, Sheffield United, Leeds and Chelsea, it was inevitable that he should also blot his copy book with Wales.
Massey had taken the lead through Dave Inniss only for the scorer to blot his copy book as his wayward back pass let in Micky Martin for the equaliser and Sphinx added second half goals through Jamie Towers (2) and Paul Gibbons.
Roberts did blot his copy book when he showed excellent skills in the box after 83 minutes and then dropped to his knees looking for another penalty and was booked.