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- v. Simple past tense and past participle of phonemicize.
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Ergo, if I'm correct that vowels triggered this uvularization in the first place and yet if I'm also correct that unaccented vowels merged into a single schwa by Mid IE, I'm forced to admit that uvulars must have already been phonemicized in the language by the time of contact with Proto-Semitic, circa 5500 BCE.
In my theory, uvulars became phonemicized and distinct from plain stops once Syncope i.e. the loss of most unstressed vowels kicked in.
Try another interpretation: During phonation shift, the modal *d of the onset phonemicized as *dʰ according to traditional theory remains modal while the second stop shifts to "breathy".
I think what happened next was that once uvular consonants became phonemicized in Late IE, *h2 was uvularized and became aligned with the new sound *q traditional plain *k.
The variations then become phonemicized and the bifurcated vowel begins to drift in two different directions of quality depending on the initial length.