to remove the contents of something, especially a load of goods from a vehicle, the bullets from a gun or the film from a camera

We watched a ship unloading (sacks of flour). 我们观看了一艘货轮卸下（面粉）。

to tell someone about your problems, the things that worry you, etc.

I've been unloading my worries on poor Ann here. 我把自己的担忧都一股脑儿倾倒给可怜的安了。

to express strong emotions such as anger freely to another person

I was so stressed out, I just needed to unload. 我极度紧张，就是需要发泄一下。