hold it in

When you have to use the bathroom, but you need to wait, you "hold it in".

Something else that people "hold in" is a secret:

She told me not to say anything about it, but I just couldn't hold it in!

So you might say that people "hold in" something that's inside of them but pushing to get out.

(do something) for a few more minutes

This is an easy expression to understand, but it might be helpful to remember it all together. Here are some other examples:

Stir it for a few more minutes.

Let's wait for just a few more minutes.