Yes, tér is a verb; it generally means to turn, or to change direction - literally or figuratively. So balra tér means turn to the left (like if you come to a fork in the road), and más tárgyra tér means "turn to a different subject", i.e., change the subject.

Also, just as an aside, the Hungarian translation of "Lassie Come Home" is titled Lassie hazatér. You can use haza as a verbal prefix with a lot of verbs to indicate motion toward home.

It should. "To come back" occupies the same space in English as "to return".

I was wondering the same thing.