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.

Learn More about blot one's copybook

Statistics for 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 21 Jan. 2021.

Comments on blot one's copybook

What made you want to look up blot one's copybook? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

Test Your Vocabulary

Words of Snow and Ice Quiz

  • image1037863653
  • Which of the following refers to thin, bending ice, or to the act of running over such ice?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Typeshift

Anagram puzzles meet word search.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!