bone up

US /boʊn ʌp/
UK /boʊn ʌp/
"bone up" picture
1.

惡補, 努力學習

to study hard, especially in preparation for a test or exam

:
I need to bone up on my history for the exam tomorrow.
我需要為明天的考試惡補歷史。
She spent the whole weekend boning up on her French vocabulary.
她整個週末都在惡補法語詞彙。