to keep a lot of something in one place, to be used in the future

We believe that he has been training an army and storing up arms. 我们确信他一直在训练军队，储备武器。

to remember things, usually so that you can tell people about them later

I listen in to their conversations and store it all up to tell you later. 我会偷听他们的谈话，把所有的内容都记住，然后告诉你。