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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“Blot one's copybook.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/blot%20one%27s%20copybook. Accessed 20 Oct. 2020.

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