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
Sigdag	-	Ancient Germanic
Custodia	-	Spanish
EilÍS	IE-leesh	Irish
Zaharina	-	Bulgarian, Macedonian
Balkwill	['bɔ:kwil]
Lesley	LEZ-lee, LES-lee	English