从天上掉到了地上

从天上掉到了地上

Literally means:

fall from the sky to the earth

Actually means:

big unpleasant or depressing change

Figuratively speaking,the phrase means that remarkable changes happen to a person or to a status and then there is big difference between before and after the change. The change involved is usually from good, high-level and a large number to bad, low-level and a small number, showing a descending tendency.

后的差别非常大。这种变化往往是从好的程度高的、数量多的变成了坏的、程度低、数量少的，表示出一种下降的状态。