Final-obstruent devoicing or terminal devoicing is a systematic phonological process occurring in languages such as German, Dutch, Breton, Russian, Turkish, and Wolof. In such languages, voiced obstruents become voiceless before voiceless consonants and in pausa.
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Dutch and Afrikaans
In Dutch and Afrikaans, terminal devoicing results in homophones such as hard 'hard' and hart 'heart' as well as differences in consonant sounds between the singular and plural forms of nouns, for example golf–golven (Dutch) and golf–golwe (Afrikaans) for 'wave–waves'.
The history of the devoicing phenomenon within the West Germanic languages is not entirely clear, but the discovery of a runic inscription from the early fifth century suggests that this terminal devoicing originated in Frankish. Of the old West Germanic languages, Old Dutch, a descendant of Frankish, is the earliest to show any kind of devoicing, and final devoicing also occurred in Frankish-influenced Old French.
English
English does not have phonological final-obstruent devoicing of the type that neutralizes phonemic contrasts; thus pairs like bad and bat are distinct in all major accents of English. Nevertheless, voiced obstruents are devoiced to some extent in final position in English, especially when phrase-final or when followed by a voiceless consonant (for example, bad cat [bæd̥ kʰæt]).
Relics of a final devoicing of "v" are to be found between words so related as "half" and "halves", and "knife" and "knives" distinguishing singular and plural.
German
Final-obstruents devoicing occurs in the varieties from Northern Germany. The German contrast between homorganic obstruents is more properly described as a fortis and lenis opposition than an opposition of voiceless and voiced sounds. Therefore, the term devoicing may be misleading, since voice is only an optional feature of German lenis obstruents. Likewise, the German term for the phenomenon, Auslautverhärtung ("final-position hardening"), does not refer to a loss of voice and is better translated as 'final fortition'. However, the German phenomenon is similar to the final devoicing in other languages in that the opposition between two different kinds of obstruents disappears at the ends of words. The German varieties of the north, and many pronunciations of Standard German, optionally involve voice in the distinction between fortis and lenis obstruents however.
Some examples from Northern German include:
Russian
Final-obstruent devoicing can lead to the neutralization of phonemic contrasts in certain environments. For example, Russian бес ('demon', phonemically /bʲes/) and без ('without', phonemically /bʲez/) are pronounced identically in isolation as [bʲes].
The presence of this process in Russian is also the source of the seemingly variant transliterations of Russian names into "-off" (Russian: -ов), especially by the French, as well as older English transcriptions.
Devoicing in compounds
In compounds, the behavior varies between languages:
Germanic languages
Most modern continental West Germanic languages developed final devoicing, the earliest evidence appearing in Old Dutch around the 9th or 10th century. However, Yiddish notably does not alter final voiced sounds; this appears to be a later reversal.
Of the North Germanic languages, Norwegian, Swedish and Danish (the latter of which has no voiced obstruents) do not have final devoicing. As in Danish, Icelandic stops are voiceless, but it has voiced fricatives which may also occur word-finally.
Gothic (an East Germanic language) also developed final devoicing independently.
Romance languages
Among the Romance languages, word-final devoicing is common in the Gallo-Romance languages, which tend to exhibit strong Frankish influence (itself the ancestor of Old Dutch, above).
Romanian does not have it. Other Romance languages such as Italian rarely have words with final voiced consonants, but borrowings from English into Italian that have a voiced final consonant (such as weekend) are not devoiced either.
Slavic languages
Most Slavic languages exhibit final devoicing, but notably standard (Štokavian) Serbo-Croatian and Ukrainian do not.
Other languages
Note: Hungarian, which lies geographically between Germanic and Slavic languages, does not have it.