It means something like "exploring the bounds of. Could this well-established use of "out" be part of the pattern that makes "overweight" work like a preposition in some fields? I think Ran Ari-Gur's comment is worth following up. A voice comes out of a cave, but out a megaphone. Nothing moves, certainly not the agent. So, to come back to MollyMooly's post at 2.
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