bone up

bone upbone up1.■〈俚〉抓紧温习(课程)(特指学生考试前临阵磨枪);(为某种目的)突击钻研(某种学科等)

bone up1.■临时突击(学习，研究)，临时准备考试，仓促准备应考，用心苦读，苦学；钻研；赶功课；填鸭式死记硬背(功课)；(考试)临时抱佛脚：He's boning up for his finals.他为应付期末考试而临阵磨枪。to bone up for an examination为应付考试而临时抱佛脚