mug up

US /mʌɡ ʌp/
UK /mʌɡ ʌp/
"mug up" picture
1.

empollar, estudiar a toda prisa

to study a subject quickly, especially before an exam

:
I need to mug up on my history before the test tomorrow.
Necesito empollar mi historia antes del examen de mañana.
She spent the whole night mugging up for her finals.
Pasó toda la noche empollándose para sus exámenes finales.