Voiced labiodental plosive

A voiced labiodental plosive or stop is a consonant sound produced like a [b], but with the lower lip contacting the upper teeth, as in [v]. This can be represented in the IPA as ⟨b̪⟩. A separate symbol that is sometimes seen, especially in Bantu linguistics, but not recognized by the IPA, is the db ligature⟨ȸ⟩.

A voiced labiodental plosive is not known to be phonemic in any language. However, it does occur allophonically.

In the Austronesian languageSika, this sound occurs as an allophone of the labiodental flap in careful pronunciation.^[1]

Features of a "voiced labiodental stop":

• Its manner of articulation is occlusive, which means it is produced by obstructing airflow in the vocal tract. Since the consonant is also oral, with no nasal outlet, it is a plosive.
• Its place of articulation is labiodental, which means it is articulated with the lower lip and the upper teeth.
• Its phonation is voiced, which means the vocal cords vibrate during the articulation.
• It is an oral consonant, which means that air is not allowed to escape through the nose.
• Because the sound is not produced with airflow over the tongue, the median–lateral dichotomy does not apply.
• Its airstream mechanism is pulmonic, which means it is articulated by pushing air only with the intercostal muscles and abdominal muscles, as in most speech sounds.

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