halfway house - a place for formerly homeless people who are being helped back into the community....kind of a 'hostel'.
Meet someone halfway - idiomatic expression, it means that you agree to work with someone as long as they are prepared to put in the effort too or make some compromise.
I walked out halfway through the film - I left in the middle of the film because it was boring.
I'm halfway through this book - I'm just about in the middle of it. (150/300 pages)
halfway to nowhere - idiomatic expression, it means that you are not making progress with something.
All these examples are off the top of my head, so I would check some of them a little more closely.