1. Keep mum about sth. 
   不提起某事
2. Keep mum about our surprise party. 
   不要讲有关我们出其不意的派对的事。
3. Go about sthbcontinue to do sth; keep busy with sth 
   继续做某事物；忙於某事物
4. I don't want anyone else to know about this affair until next week, so keep in mum. 
   我们要知道实情，可是他却讳莫如深。
5. Keep pace with sth. 
   与某人[某物]齐步前进，跟上某人[某物]

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