blot one's copybook
idiom
British, informal
: to harm one's own reputation
The star football player blotted his copybook by using bad language in an interview.
Cite this Entry
“Blot one's copybook.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/blot%20one%27s%20copybook. Accessed 27 Feb. 2025.
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