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TheGermanic spirant law, orPrimärberührung, is a specific historical instance inlinguistics ofdissimilation that occurred as part of an exception ofGrimm's law inProto-Germanic, the ancestor ofGermanic languages.
The law affects the various series of stops inProto-Indo-European that underwent Grimm's law andVerner's law. If the stops were immediately followed byt ors, they changed to voicelessfricatives (spirants):[1]
Under normal conditions, any voiced stop would likely have been devoiced before/t/ and/s/ during Proto-Indo-European times, and so all three Indo-European series of stop consonants (aspirated, voiced and voiceless) had already merged before those two consonants. Therefore, for example,/bʰt/,/bt/ and/ɡʰt/,/ɡt/ had already become/pt/ and/kt/ in some of the late Proto-Indo-European dialects. Likewise,/bʰs/,/bs/ and/ɡʰs/,/ɡs/ had become/ps/ and/ks/. Compare, for example, Latinscrībere'to write' andlegere'to gather, read' with their past participlesscrīptus andlēctus (likely also witha type of compensatory lengthening). Cases before/s/ are also numerous, as can be noticed by comparing Latinscrībere and its perfectscrīpsī, orpingere'to paint' andpīnxī and also the genitive noun formrēgis and its nominativerēx'king'.
The specifically-Germanic part of the change in which the first plosive became a fricative but not the/t/ following it seems to have been just an exception to Grimm's law. Under the normal operation of the law, voiceless plosives become fricatives in Germanic. However, if two plosives stood next to each other, the first became a fricative by Grimm's law, if it was not so already, but the second remained a plosive. That exception applied not only to series of two plosives but also to series of/s/ and a plosive, and the plosive was then preserved. In some cases, that gave alternations between two related forms, one withs-mobile and the other without, such as Englishsteer, Icelandicstjór, Dutchstier (←*steuraz ← PIE*steuros with preserved/t/) vs.Limburgishdeur,duur, Old Norseþjórr (←*þeuraz ← PIE*tauros with regularly shifted/t/).
Unlike Grimm's law in general, however, the Germanic spirant law continued to operate for some time and to have acted as asurface filter, which eliminated any sequences of a stop followed byt as they arose by borrowing or native word formation.[2] A notable example is the partial loanword*skriftiz (compare Dutchschrift) borrowed from Latinscrīptum'script'.
The change affectingdental consonants is generally assumed to have been a separate phenomenon, and it already occurred in Proto-Indo-European since other Indo-European languages show similar results. It seems to have occurred only when a dental plosive was followed by a suffix beginning with/t/; geminated/tt/ remained if it occurred within a single morpheme. Evidence from Germanic and other Indo-European languages such as Latin confirms that Latinedere'to eat' shows the past participleēsus'eaten' from earlier*ed-tus. However, a geminate/tt/ is preserved in both Gothic and Latinatta'father'.
In some instances,/ss/ was partially restored to/st/ by analogy with other words, particularly in verbs. For example, the second-person singular past form of*sitjanan'to sit' would have become*sód-ta →*sótsta →*sass (compare the related Old English wordsess'seat'). However, it was restored to*sast, based on parallel forms in other verbs such as*stalt (from*stelanan'to steal') and*halft (from*helpanan'to help').
A later change that wasfed by the spirant law was the disappearance of/n/ before/x/. The preceding vowel received compensatory lengthening and was nasalised:[3]
For example,*bringaną'to bring', past tense*branhtǭ >*brą̄htǭ (whence Englishbring,brought; Germanbringen,brachte; Danishbringe,bragte).
That nasalisation was preserved into the separate history ofOld English since it affected the outcome ofAnglo-Frisian brightening, which was conditioned by nasality. It is still present inElfdalian today.
The effect has an important consequence for some of the oldestweak verbs. As the weak past participle was formed with the Proto-Indo-European suffix*-tos, the assimilation could have occurred in all verbs with stems that ended with a stop. For most weak verbs, that was not an issue because they had stems formed with various vowel suffixes. One such suffix was*-(e)ye-, which formed denominatives and causatives. Its form in the past participle retained this suffix as an intervening vowel and so did not cause any special changes to the consonants: PIE*-(e)y-tos > PG*-idaz.
However, some of the class 1 weak verbs had been inherited asj-presents and had the suffix only in the present tense forms but not in the past tense. Some archaicathematic verbs such as'will', notably thepreterite-present verbs, also lacked a vowel suffix. In those verbs, therefore, the participle suffix came into direct contact with the preceding consonant, triggering the spirant law in those verbs. The form of the past participle was also extended to form the weak past tense, which spread the irregular participle form to the entire past.
The following table contains only forms that have survived into the modern languages. Medieval languages had many more. (The forms in brackets no longer show the effect because of levelling or, in the case of German, theHigh German consonant shift.)
| Germanic[a] | English | Frisian | Dutch | German | Icelandic |
|---|---|---|---|---|---|
| *bringaną –*branhtē | bring – brought | bring -brocht | brengen –bracht | bringen –brachte | – |
| *bugjaną –*buhtē | buy – bought | – | – | – | – |
| *maganą –*mahtē | may – might | meie –mocht | mogen –mocht | mögen –mochte | mega –mátti |
| *sōkijaną –*sōhtē | seek – sought | sykje –socht | zoeken –zocht | (suchen) | sækja –sótti |
| *þankijaną –*þanhtē | think – thought | tinke –tocht | denken –dacht | denken –dachte | þykja –þótti |
| *witaną –*wissē | wit – wist | witte –wist | weten –wist | (wissen) | vita –vissi |
Although that looks similar togrammatischer Wechsel, which causes a superficially-similar consonant alternation instrong verbs, it is unrelated. The vowel idiosyncrasies in those verbs are mostly a result of the separate and much-later development ofRückumlaut. Only when an/n/ disappeared withcompensatory lengthening of the preceding vowel did the spirant law itself result in vowel alternation. Hence, Middle High Germandenken'think' anddecken'cover' had the preteritesdāhte anddahte, respectively.
Another result of the spirant law, though far less obvious, was in the second-person singular past tense form of strong verbs, which ended with *-t, without a vowel between it and the verb stem. That caused the final consonant of the stem to undergo the change. The irregular form is preserved directly only in Gothic, however. In Old Norse, the original consonant had been restored by analogy, and the West Germanic languages had replaced the ending altogether by substituting *-ī. However, the form is preserved in the older preterite-presents, even in the older West Germanic languages: compare Gothicmagan, Old Englishmagan, Old Norsemega'may' (infinitive) andþu maht,þū meaht,þú mátt'thou mayest' (2nd pers. sg.), and-aht- regularly becomes-átt- in Old Norse.
Since the ending was*-ta in late Proto-Indo-European, the suffix should have undergone Grimm's law and become *-þ in Germanic whenever the verb stem did not end in an obstruent. However, it remained as *-t when the stem ended in an obstruct because of the spirant law. However, there is no trace of an ending *-þ in the Germanic languages (except for the rare and isolated Old English formarþ), and *-t is found instead. It is, therefore, believed[4][page needed] that since verbs ending in obstruents were so common in Germanic, the form with *-t may have been more common than *-þ. That caused the latter to eventually be regularised out of the system altogether, which left only the former as the sole ending for that form.
The effect of the Germanic spirant law can be very neatly observed also by comparing certain verbs with related nouns. A prominent example is the Proto-Indo-European verbal noun suffix*-tis, which survived and remained productive in Germanic, but other suffixes with *-t- were also in use.
| Germanic | English | Frisian | Dutch | German |
|---|---|---|---|---|
| *gebaną –*giftiz | give – gift | jaan –jifte | geven –gift | geben – Gift |
| *pleganą –*plihtiz | play – plight | pliigje –plicht | plegen –plicht | pflegen – Pflicht |
| *weganą –*gawihtiz | weigh – weight | wage –gewicht | wegen –gewicht | wiegen – Gewicht |
| *habjaną –*haftaz | (have) | (hawwe) | hebben –-achtig (and-haftig borrowed from German) | haben –Haft |
| *kleubaną –*kluftiz | cleave – cleft | kleauwe –kloft | klieven –klucht | klieben –Kluft |
| *maganą –*mahtiz | may – might | meie –macht | mogen –macht | mögen –Macht |
