Bone up on
Definition 1 of 1
Pro Tip 1/3Informal Usage
Used in casual conversation, not suitable for formal writing or speeches. 
I need to bone up on Spanish slang before my trip to Madrid.
Pro Tip 2/3Purpose Driven
Often implies preparation for a specific event or deadline, like an exam or presentation. 
She's boning up on her biology to ace the final test.
Pro Tip 3/3Complete Understanding
Implies a thorough approach to learning, not just a superficial overview. 
To debate effectively, you must bone up on your facts.