blot one's copy book
/blɒt wʌnz ˈkɒpi bʊk/
To make a serious mistake or error.
“One should never blot one's copy book at work.”
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inoh
inoh
/blɒt wʌnz ˈkɒpi bʊk/
To make a serious mistake or error.
“One should never blot one's copy book at work.”
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