Question posed by a middle-aged country businesswoman, of pasiego-speaking mother and generic coastal-rural father. Actuación also > a/θ/tuación, but unfortunately no one in the vicinity was suffering from jaundice, and her (absent) parents were only in their 70s, so I didn’t get round to discovering whether she would have generalised ictericia > i/θ/tericia, octogenario > o/θ/togenario, et/θ/ et/θ/.
I’ve never come across this bit of phonetic phreakery before, so the obvious explanations are ignorance on my part or idiolect on hers. I suppose (without much confidence) that recent open surgery for a cranial arteriovenous fistula might lead one to search in the latter direction.
The only vaguely analogous case (-)act(-) I can think of, which also involves straying from the Latin root, is the generalised penultimate syllable perfecto > perfeuto etc which Alonso Zamora Vicente (Dialectología española) says was to be found in Santander, Zamora, Castilla, Extremadura, Andalucía…
A rather more far-fetched explanation–which is, let’s face it, why you and I are here–is that she believed I was an aztor, aka astor and generally azor in contemporary Spanish, which is to say a glede or European kite.
However, as far as I know even Manuel Llano, the great inventor of Cantabrian folklore (see eg Brañaflor (1931) and the criticisms of Adriano García-Lomas in Mitología y supersticiones de Cantabria (1964)), didn’t describe shape-shifters luring hawks and wolves to their table with spurious finch and lamb calls.
Swallowing disappointment, I suppose if I could choose I’d be his pájaro de ojos amarillos, a yellow-eyed owl-bat cross with a heart as hard and black as stone whose looks maim and kill, but only while the church bells are ringing. That franchise may, however, already be taken, give or take some coloured contact lenses.
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Looks like someone has theorized on that too:
http://www.lingref.com/cpp/hls/10/paper1794.pdf
I find pronunciation of “pacto” as “pazto” a very common occurrence, but that is probably influenced by the idea that “pacto” has something to do with “paz”.
Paz/pacto > hoho!!!
The paper (Carolina González, Assimilation and Dissimilation of Syllable Final /k/ in North-Central Spanish) makes me realise that I don’t listen to the language enough, or, in particular, hard enough. I haven’t got the intellectual background to guess whether she’s right or wrong, but I love the approach, in the eureka sense, and the examples are causing howls of recognition from the breakfast table.
It’s extraordinary how little (serious) public comment there is on phenomena like this which are so widespread and well-recognised. Where’s the Spanish Language Log? What do academic linguists here do all day?