rub up 1. 擦拭；擦亮 rub up a silver spoon 擦亮银匙 2. 〈口〉温习；提高 Your typing is a bit rusty; you'd better rub it up. 你的打字有点荒疏了；你最好复习一下。 I'll have to rub up my French before I go to Paris. 我去巴黎前得把法语复习提高一下。 3. 〈口〉唤起(记忆) I must rub up my memory and recall where I laid it. 我得好好想想我把它放到哪儿去了。 4. 把(颜料等)调成糊状 5. 〈俚〉行手淫