柯林斯词典brush up (also brush up on) (brushing,brushed,brushes) 1. PHRASAL VERB If you brush up something or brush up on it, you practise it or improve your knowledge of it. 温习; 加强…知识 I had hoped to brush up my Spanish. 我曾希望提高一下我的西班牙语。 返回 brush up