re: #104 Nyet

OK, up have I looked and “up” in “looked up” or “put up” or “out” in “hang out” is officially called a particle, not a preposition. So it can’t fall under the rule in any case.

“Up” can also be a completive. You can eat something or burn something, but if you eat it up or burn it up, it’s gone.

It’s the main completive in baby talk, which in most languages is a good sign of the true underlying mechanisms.