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.
Dictionary Entries Near blot one's copybook
Cite this Entry
“Blot one's copybook.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/blot%20one%27s%20copybook. Accessed 29 Nov. 2024.
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