【时尚俚语】catch up on something:

1. to do whatever you have not had time to do; 2. to find out about something，中文意思是：

1. 去做之前没时间完成是事情；

2. 了解、发现某事物；例句：I have to catch up on my reading. 我得去继续还没完成的阅读了