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.

• a bright spot
• a broad church
• a Bronx cheer
• Absence makes the heart grow fonder.
• a bucks party
• a bully pulpit
• a bumpy ride
• a bum rap
• a bum steer
• a bundle of joy
• a busman's holiday
• a buzz word
• a call girl
• a calling card
• a camp follower
• a can of worms
• a carbon copy
• a carrot and stick
• a carrot and stick approach
• a carrot-top
• a case in point
• a cash cow
• a cat and mouse game
• a cattle market
• a cause celebre