Th-debuccalization
Encyclopedia
Th-debuccalization
Debuccalization
Debuccalization is a sound change in which a consonant loses its original place of articulation and becomes or . The pronunciation of a consonant as is sometimes called aspiration, but in phonetics aspiration is the burst of air accompanying a plosive...

is a process in varieties of Scots
Scots language
Scots is the Germanic language variety spoken in Lowland Scotland and parts of Ulster . It is sometimes called Lowland Scots to distinguish it from Scottish Gaelic, the Celtic language variety spoken in most of the western Highlands and in the Hebrides.Since there are no universally accepted...

 and Scottish English
Scottish English
Scottish English refers to the varieties of English spoken in Scotland. It may or may not be considered distinct from the Scots language. It is always considered distinct from Scottish Gaelic, a Celtic language....

 where a voiceless dental fricative θ (spelled th) at the beginning of a word and between vowels becomes the voiceless glottal fricative h. It is a stage in the process of lenition
Lenition
In linguistics, lenition is a kind of sound change that alters consonants, making them "weaker" in some way. The word lenition itself means "softening" or "weakening" . Lenition can happen both synchronically and diachronically...

.

Th-debuccalization occurs mainly in Glasgow
Glasgow
Glasgow is the largest city in Scotland and third most populous in the United Kingdom. The city is situated on the River Clyde in the country's west central lowlands...

 and across the Central Belt
Central Belt
The Central Belt of Scotland is a common term used to describe the area of highest population density within Scotland. Despite the name, it is not geographically central but is nevertheless situated at the 'waist' of Scotland on a conventional map and the term 'central' is used in many local...

. A common example is [hiŋk] for think. This feature is becoming more common in these places over time, but is still variable. In word final position, [θ] is used, as in standard English.

The existence of local [h] for /θ/ in Glasgow complicates the process of th-fronting
Th-fronting
Th-fronting refers to the pronunciation of the English "th" as "f" or "v". When th-fronting is applied, becomes and becomes...

 there, a process which gives /f/ for historical /θ/. Unlike in the other dialects with th-fronting, where /f/ solely competes with /θ/, in Glasgow, the introduction of th-fronting there creates a three-way variant system of [h], [f] and [θ].

Use of [θ] marks the local educated norms (the regional standard), while use of [h] and [f] instead mark the local non-standard norms. [h] is well-known in Glasgow as a vernacular variant of /θ/ when it occurs word-initially and intervocalically, while [f] has only recently risen above the level of social consciousness.

Given that th-fronting is a relatively recent innovation in Glasgow, it was expected that linguists might find evidence for lexical diffusion for [f] and the results found from Glasgow speakers confirm this. The existing and particular lexical distribution of th-debuccalization imposes special constraints on the progress of th-fronting in Glasgow.

In accents with th-debuccalization, the cluster /θr/ becomes [hr] giving these dialects a consonant cluster that doesn't occur in other dialects. The replacement of /θr/ with [hr] leads to pronunciations like:
  • three - [hri]
  • throw - [hro]
  • through - [hru]
  • thrash - [hraʃ]
  • thresh - [hrɛʃ]
  • threw - [hru]
  • thrown - [hron]
  • thread - [hrɛd]
  • threat - [hrɛt]
  • throne - [hron]

See also

  • Th-debuccalisation homographs
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