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.’
    • ‘Who wants to blot their copybook with one of the country's biggest donors?’
    • ‘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.’
    • ‘Hasn't he just blotted his copybook in his dotage by coming out in favour of nuclear power?’
    • ‘Over 800 years the family only once blotted its copybook.’
    • ‘He blotted his copybook at Horsfall by making himself unavailable for Tuesday's game at Harrogate.’
    • ‘Another has blotted his copybook on his two most recent starts after a promising start to his chasing career.’
    • ‘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.’
    • ‘There are only two minor plateaus blotting her copybook - one in early February and one in mid-April.’
    • ‘If they blot their copybook, it could be refused.’
    • ‘But he blotted his copybook when he pulled Ronaldo's shirt to concede the penalty.’
    • ‘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.’
    • ‘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.’
    • ‘Youthful, knowledgeable, approachable and enthusiastic but he soon blotted his copybook with both the players and the media.’
    • ‘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.’
    • ‘My take was that his new-found partisanship blotted the copybook of his former life.’
    • ‘Because genuine accidents do occur, the police, not wanting to blot their copy book, write it off.’
    • ‘An odd lapse or two blotted an otherwise impressive copybook’
    tarnish, sully, blacken, stain, besmirch, smear, blot, blemish, stigmatize, mar, corrupt, defile, soil, muddy, foul, dirty, damage, injure, harm, hurt, debase, infect, poison, vitiate, drag through the mud, blot one's copybook
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