Dictionary
Words, grammatical forms and meanings linked to the ontology.
blot one's copy book en · VERB
Pronunciation
Meanings
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(idiomatic) To damage one's own reputation through bad behavior.
Indeed, it was not uncommonly heard that the crown should skip a generation and be conferred on Prince William, who, so far at least, had not blotted his copybook and was more popular than his father.
2023, Theodore Dalrymple, “From Duty to Decadence”, in City Journal:Now, it was the College that had blotted its copybook
1935, Dorothy L. Sayers, Gaudy Night:
Forms