I think you’re wrong, Sam2.
I’m pretty sure it is “avira” (as in air of, not “ara” as in land of) and it is “machkim”.
But I can’t find it!
Anybody care to look it up?
With regard to yishuv Ha’Aretz, there’s a great tape from Rav Frand on it. He can tell you a lot more, and a lot more authoritatively, than I can.