blot copybook

blot your copybook

(British & Australian)

to do something which spoils someone's opinion of you She blotted her copybook by arriving late to a meeting.

Name	Pronounced	Usage
Myrtie	MUR-tee	English
Keysha	-	African American (Rare)
Salena	-	English (Modern)
Mateu	-	Catalan
Bence	-	Hungarian
MadailÉIn	-	Irish