断绝往来 [- - wǎnɡ lái]break off one's acquaintance with sb.; break off friendly relations; cut off communication(s); sever friendship; stop [break off] intercourse：
•¶ 你和约翰那样的人断绝往来是明智的， 对于你他并不是一个好伙伴。 It will be advisable for you to drop an acquaintance such as John; he is not a good companion for you.