Run after 追赶；追逐
例句：
He spends lots of money running after girls.
他花了很多钱追女孩。
If you run after two hares,you will catch neither.
两只兔子都逮，一只也逮不着。
A:What's the rush?
什么事这么匆忙？
B:It's just, I was late, so I have to run after the bus.
就是，我迟到了，不得不追赶公共汽车。
A:Oh, god, do you want me to get you a drink?
哦，天哪，你要我帮你倒杯水吗？