[d]→[b]Certainty: 4/5Commonality: 4/5

Labialization Place Assimilation Germanic Italic

Voiced alveolar plosive to Voiced bilabial plosive

The shift from the alveolar stop [d] to the bilabial stop [b] is a classic example of regressive place assimilation. It occurs when the tongue's alveolar position for [d] is abandoned in favor of the lip-closure required for a following bilabial sound (like [p] or [b]).

Phonetic Effects

Place Assimilation, Labialization

Language Examples

English (Connected Speech) Germanic

bad boy [bæd bɔɪ]→[bæb bɔɪ]— Regressive place assimilation: /d/ adopts bilabial place before following /b/ in rapid speech.

Latin Italic

ad- + breviāre→abbreviāre— Historical prefix assimilation: ad- [d] became [b] before following bilabial, frozen into the spelling.

Related Transformations

Reverse Nasal equivalent: Place assimilation

More Germanic Shifts

[a] → [ã] — Assimilatory Nasalization [a] → [∅] — Elision [a] → [ʔ] — Glottalization [a] → [ə] — Vowel Reduction [æ] → [ɛ] — Vowel Raising

Sources & References

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