blot your copybook
US /blɑt yər ˈkɑp.i.bʊk/
UK /blɑt yər ˈkɑp.i.bʊk/
1.
manchar el expediente, arruinar la reputación
to do something that spoils your good reputation or record
:
•
He was a promising student, but he blotted his copybook by cheating on the final exam.
Era un estudiante prometedor, pero manchó su expediente haciendo trampa en el examen final.
•
One mistake could blot your copybook for years to come.
Un error podría manchar tu expediente durante años.