Question

write it down.中的down是什么意思？

Answer 1

write it down：把它写下来

down：（写）下，（记）下

例句：
Anytime you write something down, it makes it a more permanent goal.
任何时候只要你写下想的事情，它就能变成长期目标。

When he took out a piece of paper to write something down, the paper was wet and then he knew that it was raining.

当他拿出一张纸来记下什么的时候，纸都是湿的，他这才意识到天下雨了。

Need to write down something but have no paper?

需要的东西写下来，却没有文件？

I want to write down something happened recently.

心血来潮想在这上面写点最近发生的事情。

Here is VIP space for you. Write down something please.

这里是为阁下特别预留的贵宾位置，恭请阁下留下墨宝。

希望能帮到你

Answer 2

写下来。。。。