Definition of blot one's copybook in English:

blot one's copybook

phrase

British
  • Tarnish one's good reputation:

    ‘she saw her sister blot her copybook by being quoted in the press’
    • ‘Although analysts are bullish on the banks, it would be all too easy for bad debt jitters to blot their copy books.’
    • ‘But he blotted his copybook when he pulled Ronaldo's shirt to concede the penalty.’
    • ‘My take was that his new-found partisanship blotted the copybook of his former life.’
    • ‘Hasn't he just blotted his copybook in his dotage by coming out in favour of nuclear power?’
    • ‘Nobody expects him to get a big government rail job - he blotted his copybook with civil servants over English Heritage - though his experience would make him an obvious choice.’
    • ‘Over 800 years the family only once blotted its copybook.’
    • ‘It would have been a ludicrous way for Liverpool's biggest summer signing to blot his copybook as his ambitious move began to gain all the hallmarks of a beautiful relationship.’
    • ‘Youthful, knowledgeable, approachable and enthusiastic but he soon blotted his copybook with both the players and the media.’
    • ‘An odd lapse or two blotted an otherwise impressive copybook’
    • ‘The big all-rounder produced another impressive bowling performance on the first day of the Championship match against Kent, but blotted his copybook by dropping a tricky slip chance late in the day.’
    • ‘It blotted its copybook by issuing a couple of profits warnings, but it still has £2bn in the bank so its shares could go higher from this level.’
    • ‘However, the big striker blotted his copybook on his return missing a penalty in 29 minutes.’
    • ‘Thus, with capital freely moving into every potential nook and cranny, countries which have blotted their copybook, or have no copybook at all, are suffering disproportionately.’
    • ‘Who wants to blot their copybook with one of the country's biggest donors?’
    • ‘If they blot their copybook, it could be refused.’
    • ‘But if you haven't blotted your copybook to quite that extent then you could probably improve the look of your files in as little as six months.’
    • ‘Because genuine accidents do occur, the police, not wanting to blot their copy book, write it off.’
    • ‘There are only two minor plateaus blotting her copybook - one in early February and one in mid-April.’
    • ‘Another has blotted his copybook on his two most recent starts after a promising start to his chasing career.’
    • ‘He blotted his copybook at Horsfall by making himself unavailable for Tuesday's game at Harrogate.’