Phrasal verbs 공부하다

복습

I will have to BONE UP to get a good result.
반복적으로 다듬다. [뼈로 문질러 윤내다]

I need to BONE UP ON my French grammar for the test.  cf. cram 

I BUFFED UP ON my grammar before the test.

She took a two-week course to BRUSH UP her Spanish before she went travelling around South and Central America.  

The teacher DRILLED the rules INTO the students.

Hammer I'll CHEW ON it for a day or two and let you know what I think. Harp