1. run into sb./someone=meet someone by chance偶遇
Guess who I ran into today? Our old school friend Nancy! Small world, isn’t it?
猜猜我今天碰到谁了？我们的老同学Nancy！世界可真小啊！
2. run it to earth: 原意“赶进洞里”，指搜查，追查
比喻刨根问底或追本溯源，与汉语俗语“打破沙锅问到底”相似。出自英国的狩猎故事。
The book was out of print, but I eventually ran it to earth at a secondhand bookshop.
那本书已经绝版，但我终于在一家旧书店淘到了它。
3. go to earth/ground: 指人为了躲避外界的纠缠而隐藏起来
The film star eventually went to earth in a small, out-of-the-way cottage.
这位电影明星最后跑到一个荒避的小村舍躲了起来。
4. run of the true love: 真爱之路
指真正的爱情道路并不平坦，用于比喻好事多磨或苦尽甘来，与“有情人终成眷属”相似。
Have you ever heard run of the true love? You’ve got to get out of your blue funk first and try to see her again.
你有没有听说过真正的爱情道路不平坦这句话？你首先得振作起来，然后再设法去见她。