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 1 Feb. 2023.

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