bone up on something phrasal verb (see also bone)
to learn as much as you can about a subject, because you need the knowledge, for example for an examination:
I have to bone up on criminal law for a test next week.

[TahlilGaran] Dictionary of Contemporary English ▲

bone up on
bone up (on (something))
to study or improve your understanding of something, esp. for a test.
The test includes history, math, and languages, so I'll have to bone up on a lot of subjects.

With new developments in medicine happening all the time, doctors continually need to bone up.

[TahlilGaran] English Idioms Dictionary ▲

bone up on something
bone up (on (something))
to study or improve your understanding of something, esp. for a test.
The test includes history, math, and languages, so I'll have to bone up on a lot of subjects.

With new developments in medicine happening all the time, doctors continually need to bone up.

[TahlilGaran] English Idioms Dictionary ▲

bone up on something
to study or review (something)
I decided to take a course at night to bone up on my Spanish.

[TahlilGaran] English Idioms Dictionary ▲