Voiced bilabial flap

A voiced bilabial flap is an uncommon non-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 and some of its neighbors.^{[citation needed]}

IPA number184 413

Entity (decimal)ⱱ​̟

Unicode (hex)U+2C71 U+031F

Quick facts ⱱ̟, w̆ (b̮) ...

Voiced bilabial flap
ⱱ̟
w̆ (b̮)
IPA number	184 413
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Encoding
Entity (decimal)	ⱱ​̟
Unicode (hex)	U+2C71 U+031F
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In Mono, the sound has been described as follows:

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.^[1]

And, for allophony between the bilabial and labiodental flap,

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.

In the literature, this sound has most often been transcribed with ⟨w̆⟩,^[2][3][4] a ⟨w⟩ modified by an extra-short diacritic.^[a] A less frequently used alternative transcription is ⟨ⱱ̟⟩,^[5][6] a labiodental flap ⟨ⱱ⟩ modified by an advanced diacritic. In addition, the symbol ⟨ⱳ⟩, a W with hook, is supported by SIL Global as a para-IPA transcription for this sound.^[7]