blot one's copybook
volume

"blot one's copybook"の定義と意味

to blot one's copybook
01

to make a mistake that brings about a negative consequence

to [blot] {one's} copybook definition and meaning
FormalFormal
IdiomIdiom
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Example
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He blotted his copybook by getting caught cheating on the exam.
He is blotting his copybook by constantly missing his deadlines.
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