blot (one's) copy book

(redirected from blot his copybook)

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

blot your copybook

BRITISH
If you blot your copybook, you damage your reputation by doing something wrong. Their relationship had been so perfect. Until he'd blotted his copybook with Susan, that is. Note: You can also say that there is a blot on your copybook. In fact, just about the only blot on his copybook so far was a missed penalty against Arsenal 10 days ago. Note: In the past, schoolchildren had `copybooks'. These were books of examples of handwriting, with spaces for the children to copy it.
See also: blot, copybook

blot your copybook

tarnish your good reputation. British
A copybook was an exercise book with examples of handwriting for children to copy as they practised their own writing.
See also: blot, copybook

blot your ˈcopybook

(old-fashioned, informal) spoil a previously good record: He paid back the money he had stolen, but he had blotted his copybook and couldn’t hope for promotion.A copybook was an exercise book with printed examples of good writing for children to copy. If you blotted it, you accidentally spoiled it by making a mark with ink on it.
See also: blot, copybook
References in periodicals archive ?
Although he appeared to blot his copybook with U's boss John McGreal when he was sent off for violent conduct after twice pushing Cheltenham Town midfielder Joe Morell in the face in his last match for the Essex club on Saturday, it's believed the Colchester may still be interested in extending his stay.
He does, however, blot his copybook later by trying to kiss her.
He did blot his copybook a little bit when he was 'rolled' by Romelu Lukaku but a lot of defenders have suffered a similar fate this season.
But Nicklin appeared to blot his copybook when he failed to hold Cameron Darkwah's shot only for Rob Hopley to fire into the side netting when it would have been easier to score.
It came after a sizzling 50-metre break from young scrum-half Rhodri Williams, only for Thomas to blot his copybook soon after when missing a straight penalty.
The recent appointment of Mark Shanks at Ayr United has Stranraer connections as Mark is a local lad, although he did blot his copybook with a spell at Queen of the South.
Holland's enforced absence has proved expensive and he has resolved not to blot his copybook again this year.
And perhaps Harry wouldn't be so keen on the hassle that the 30-year-old, who has even managed to blot his copybook in France despite the lovely surroundings, would bring back to Loftus Road.
However, he did blot his copybook when falling at the first fence in the Scottish National.