Definition
To rain very heavily.
（雨）倾盆而下；下大雨
It's pelting down; let's hurry inside.
雨下得很大；我们快点进去吧。
We'd better get to our destination before it starts pelting down.
我们最好在下大雨前到达目的地。
It looks like it's about to pelt down; we should hurry home.
看起来快要下大雨了；我们应该赶快回家。