Definition of blot one's copybook in English:
British Tarnish one’s good reputation: she saw her sister blot her copybook by being quoted in the press
More example sentences
- There are only two minor plateaus blotting her copybook - one in early February and one in mid-April.
- 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.
- Another has blotted his copybook on his two most recent starts after a promising start to his chasing career.
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