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| {{infobox IPA
| | #REDIRECT [[Wikipedia:Bilabial flap]] |
| |ipa number=184 413
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| |ipa symbol=ⱱ̟
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| |ipa symbol2=b̆
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| |imagesize=130px
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| |imagefile=Labiodental flap with diacritic.png
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| |decimal1=11377
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| |decimal2=799
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| }}
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| The '''bilabial flap''' is an uncommon non-[[Rhotic consonant|rhotic]] flap. It is usually, and perhaps always, an [[allophone]] of the [[labiodental flap]], though it is the preferred allophone in a minority of languages such as [[Banda people|Banda]] and some of its neighbors.
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| In [[Mono language (Congo)|Mono]], the sound has been described as follows:
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| {{blockquote|In the first step, the lower lip retracts into the oral cavity to a position behind the upper teeth. At the same time, the upper lip descends to wrap over the upper teeth. In the second step, the lower lip moves forward quickly, flapping against the upper lip as it exits the oral cavity. It is voiced throughout the articulation. In addition, during the articulation of the sound, the tongue bunches in the back of the mouth, adding a velar component to the sound.<ref>Kenneth S. Olson (2005) ''The Phonology of Mono'', SIL Issue 140</ref>}}
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| And, for allophony between the bilabial and dentolabial flap,
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| {{blockquote|The articulation of the sound consists of two stages. First, the lower lip is retracted slowly into the mouth well behind the upper teeth. Second, the lower lip is brought forward rapidly striking the upper lip or upper teeth in passing.}}
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| In the literature it has often been transcribed by a ''w'' modified by the [[extra-short (phonetics)|extra-short]] diacritic, {{angbr IPA|w̆}}.<ref>{{Harvcoltxt|International Phonetic Association|1989|p=70}}</ref><ref>{{Harvcoltxt|Olson|Hajek|2003|p=158}}</ref>
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| In 2005 the International Phonetic Association adopted the ''right hook v'' symbol to represent the labiodental flap.<ref>{{Harvcoltxt|International Phonetic Association|2005|p=261}}</ref> Since then, the received transcription of the bilabial flap involves employing the labiodental flap symbol modified by an [[advanced (phonetics)|advanced]] diacritic: {{angbr IPA|ⱱ̟}}.<ref>{{Harvcoltxt|Olson|Hajek|1999|p=112}}</ref> Since flaps are similar to brief stops, it could alternatively be transcribed as {{angbr IPA|b̆}}.
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| == Occurrence ==
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| {| class="wikitable"
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| !colspan=2| Language
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| ! Word
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| ! [[International Phonetic Alphabet|IPA]]
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| ! Meaning
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| ! Notes
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| |-
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| |colspan=2| [[Mono language (Congo)|Mono]]<ref>{{Harvcoltxt|Olson|2004|p=233}}</ref>
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| | '''''vw'''a''
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| | {{IPA|[ⱱ̟a]}}
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| | 'send'
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| | Contrasts with {{IPA|/v/}} and {{IPA|/w/}}. In free variation with [[labiodental flap]]
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| |}
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| ==Notes==
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| {{reflist}}
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| ==References==
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| {{refbegin}}
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| *{{citation
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| |author=International Phonetic Association
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| |year=1989
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| |title=Report on the 1989 Kiel Convention
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| |journal=Journal of the International Phonetic Association
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| |volume=19
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| |pages=67–80
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| |doi=10.1017/S0025100300003868
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| }}
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| *{{citation
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| |author=International Phonetic Association
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| |year=2005
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| |title=IPA news
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| |journal=Journal of the International Phonetic Association
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| |volume=35
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| |issue=2
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| |pages=261–262
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| |doi=10.1017/S0025100305002227
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| }}
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| *{{citation
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| |last=Olson
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| |first=Kenneth S.
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| |year=2004
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| |title=Mono
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| |journal=Journal of the International Phonetic Association
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| |volume=34
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| |issue=02
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| |pages=233–238
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| |doi=10.1017/S0025100304001744
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| |url=http://www.sil.org/system/files/reapdata/11/37/52/113752932904084361138922206226269471614/Olson2004.pdf
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| }}
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| *{{citation
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| |last=Olson
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| |first=Kenneth S
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| |last2=Hajek
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| |first2=John
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| |year=1999
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| |title=The phonetic status of the labial flap
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| |journal=Journal of the International Phonetic Association
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| |volume=29
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| |issue=2
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| |pages=101–114
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| |doi=10.1017/S0025100300006484
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| }}
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| *{{citation
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| |last=Olson
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| |first=Kenneth S
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| |last2=Hajek
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| |first2=John
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| |year=2003
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| |title=Crosslinguistic insights on the labial flap
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| |journal=Linguistic Typology
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| |volume=7
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| |issue=2
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| |pages=157–186
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| |doi=10.1515/lity.2003.014
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| }}
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| {{refend}}
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| ==Further reading==
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| {{refbegin}}
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| *Olson and Hajek, 2001. [https://www.sil.org/system/files/reapdata/10/76/25/107625936272784954557845830958722363836/SILEWP2001_002.pdf 'The Geographic and Genetic Distribution of the Labial Flap']
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| *{{citation
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| |last=Olson
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| |first=Kenneth
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| |last2=Schrag
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| |first2=Brian
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| |year=2000
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| |chapter=An overview of Mono phonology
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| |editor-last=Wolff
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| |editor-first=H.E.
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| |editor2-last=Gensler
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| |editor2-first=O.
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| |title=Proceedings from the 2nd World Congress of African Linguistics, Leipzig 1997
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| |place=Cologne
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| |publisher=Rüdiger Köppe
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| |pages=393–409
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| }}
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| {{refend}}
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| ==External links==
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| * {{phoible|ⱱ̟}}
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| {{IPA navigation}}
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| [[Category:Bilabial consonants]]
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| [[Category:Flap consonants]]
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| [[Category:Pulmonic consonants]]
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