How to remove an app from my iPhone (freeing memory) but keep it in iTunes?

I have a couple of apps that I have rarely used and which not only are HUGE (taking lots of memory) but also get frequent and large updates. (Almost every time I download app updates at least one of these apps has an update, and it's usually as big as All the other updates combined and takes 20 minutes or longer.)

I'm also seriously cramped for memory in the phone, so I'd really like to remove these apps from my phone. It's very possible that I will never want to use these apps again, but then again I might. And I paid for them so I don't want to totally remove them from iTunes (and have to buy them again if I decide I do want to use them.) So how do I free the space on the phone and eliminate the maintenance overhead, but not give up the prerogative of using them in the future?

Details:
iPhone 4 16GB
iOS 5.1.1
iTunes 10.6.3.25

How to hard reset iphone if lock button is broken?

I know that the best way to fix an iphone that just shuts off is to "hard reset" it by holding the lock button and the home button, but my lock button just broke a few days ago. What do i do?

Added (1). Its an iphone 4, but i have no idea how to take the battery out

I dropped my iPhone 4S in water? - 2

I dropped the top of my iPhone into some water (it only went up as far as the beginning of the screen) it seems to be working fine, but is there anything I should do to make sure, or will it be okay?

Updated iPhone iOS 6.0 and it deleted All MY CONTACTS

I do not have anything stored on icloud. Now, I do have all my stuff stored to my computer on iTunes, i just tried to restore my iPhone, but my contacts are not there. I'm very frustrated and mad that this happened.

Can I use iPhone 4 without it being activated?

My friend wants to sell me his iPhone 4S for 50$ it's in near to almost perfect condition. I want to buy it, but I have a phone with a plan. So I want to know if I can still use things like the AppStore or iTunes and things like that. Can I use the Internet when connected with Wi-Fi?

When will iphone 5 restock for at&t?

I called every at&t store around me and they are all sold out, they still had some in stock earlier today but not anymore, i'm looking to get the iphone 5 as soon as possible, when will they restock again? One of the stores told me the got in a shipment today wich they didn't expect, do you think they will have more tomorow? I want the iphone 5 so bad. They said i can order it but it will take about 4 weeks and i'm not trying to wait that long

How to play Minecraft Pocket Edition on Wi-Fi?

I'm away from home and my bro and I want to play minecraft on my iPhone and his iPod. But when we try to play over Wi-Fi it just says its searching and it takes forever. We're both on the same network and both of our servers are visible but they still won't connect. What should we do?