blot one's copybook

idiom

Definition of blot one's copybook

British, informal
: to harm one's own reputation The star football player blotted his copybook by using bad language in an interview.

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Dictionary Entries Near blot one's copybook

blotless

blot one's copybook

blot on the escutcheon

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Cite this Entry

“Blot one's copybook.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/blot%20one%27s%20copybook. Accessed 19 Oct. 2021.

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