How does it happen? What motivated latin "parabola" to change into Spanish "palabra" and why does english "ask" is often changed to "aks"?

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    Why is the sound changes in palabra analysed as metathesis? It is simpler to consider a lambdacism + a rhotacism. – amegnunsen Jan 1 '19 at 16:05
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    @amegnunsen Could you explain why that's simpler? – tobiornottobi Jan 1 '19 at 16:23
  • @tobiornottobi Because the cost is less high. Rhotacism and lambdacism are sound changes already present in Romance languages. Dissimilation r/l in Latin is well known. Moreover, It is more usual to see metathesis between adjacent sounds, here r and l are not side by side. It is just a thought, nothing certain. – amegnunsen Jan 1 '19 at 17:08
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    @amegnunsen are there lambdacisms and rhotacisms in Spanish in the same environments as here? If not, then metathesis may be a less costy explanation. – LjL Jan 1 '19 at 17:37
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    Resonants that can be syllabic, like r, l, n, etc. often shift position with their vocalic parts, so that -er- and -re-, for instance, are common variations with no particular significance. When you have two of them, like l and r, they can do all kinds of tricks. Consider the Spanish and English spellings of colonel, for instance, and their respective pronunciations. Or consider marble and Lat marmora, or just the ordinary morphology of the Latin adjective ending -alis. – jlawler Jan 1 '19 at 17:47

This is just a partial answer.

I think metathesis is often explained in terms of perceptual similarities between the variants. Additionally, sometimes we can say that one form has a "preferred" phonotactic structure. But in general, metathesis is known to be a difficult thing to explain in terms of linguistic theory.

The Spanish case is complicated because Romance languages are known to have processes of lambdacism/rhotacism that aren't metathesis-based (as amegnunsen mentioned in a comment; although I don't know of any specific Latin-to-Spanish sound laws that would be relevant here), and also processes of liquid dissimilation ("pelegrino" is attested as a variant form of peregrino, from Latin peregrīnus). So at first glance, it isn't entirely obvious that palabra is best analyzed as a case of long-distance metathesis. It's probably necessary to look carefully at the details of how this word and similar words developed in Spanish to determine whether it is a true case of metathesis (and if so, why/how the consonants metathesized). Unfortunately, I have not done this, so I can't say anything certain about the situation here. Ukemi's answer to How did 'cocodrilo' originate from 'crocodile'? gives other examples of liquid metathesis in Spanish (and also of other changes).

Changes between sk and ks have been somewhat common in the history of English, and can also be seen in Romance in various words, but I don't know what explanation would account for the presence of metathesis in the word ask. As mentioned in the Language Log post "Leaf-blower metathesis?", we see -ks variants in Old English, at a stage where the consonant cluster was intervocalic (as far as I can tell, in all forms of the word). In some languages, such as Faroese and apparently also Lithuanian, we see a process of metathesis of -sk- to -ks- before certain consonants that are added by inflection (the details differ between the languages; see "Metathesis: Formal and Functional Considerations", Hume 2001, for descriptions), but that doesn't seem relevant in the case of English ask; I don't know of any dialect of English that has a paradigm like /ask, asks, akst/. English speakers may show cluster simplification of the three-consonant word-final sequences /sks/, /skt/ or /kst/, but I don't think that's very similar to what we see in Lithuanian or Faroese.

Changes between sp and ps are also known to occur; e.g. in the word for wasp.

If we analyze the ask~aks variation as a example of synchronic metathesis in English, it's probably related in some way to the position of the -sk sequence in the coda of the syllable in the plain form ask. I don't think that any appreciable amount of English speakers produce /ks/ instead of /sk/ at the start of words. The only other example of /sk/~/ks/ variation at the end of a word that I can think of is asterisk, which has a (fairly stigmatized) variant pronunciation ending in /ks/.

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As a sound change, there are very many ways for it to happen. In the case of "ask", the cause is lost in history. The OED indicates that forms like achsian, acsian are attested in Old English, and in Middle English gained popularity in the south and the midlands, but was considered vulgar. But this isn't a regular sound change, and in current English this example stands alone. Metathesis as a sporadic process in child language acquisition has been observed in Japanese; lateral metathesis presumably is related to the "localization" problem which also underlies lateral dissimilation, namely it is perceptually hard-ish to localize r vs. l in the speech stream, and the "surface template" (if there is such a thing) is that the lateral should be first, thus liquid dissimilation tends to favor l...r. The idea behind the perceptual account is that a listener knows that there are liquids but isn't entirely sure what order they are, and they default the the order l...r.

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    I wouldn't be surprised if liquids and especially flaps and trills were the most likely sounds to move to a different location in a syllable. For one, they can often occur very freely. Since they are so sonorant, they occur adjacent to the syllable nucleus – so the extremes they can occur in are closer than of less sonorous consonants. And the articulation of flaps and trills can be very challenging in some environments – If you don't time the articulatory movement and your air stream right, the articulation can simply fail. – tobiornottobi Jan 1 '19 at 17:28
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    In Northern Italian and Occitan dialects, there are (sporadic, as in, heavily dialect-dependent) examples of liquid metathesis of the form dormirdromir, or comprarcrompar (final <r> usually not pronounced, just sometimes present in the orthography). In some Catalan dialects, while it's not metathesis but deletion, it's common to pronounce words like aprendre as apendre. – LjL Jan 1 '19 at 17:41
  • Can you elaborate on "surface template"? – TKR Jan 1 '19 at 22:00

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