blot one's copybook
Definition: to spoil one's reputation
Example: The prime minister blotted his copybook by being involved in the scandal.
Usage note: informal idiom
A Daily Updated Dictionary of English Idioms
You are here: Home > 2007 > December > blot one's copybook
Definition: to spoil one's reputation
Example: The prime minister blotted his copybook by being involved in the scandal.
Usage note: informal idiom