The Universal Atlas of Phonetic Evolution
Back to Matrix [b] → [p] Edit this Data

[p]→[b]Certainty: 5/5Commonality: 5/5

Voiceless bilabial plosive to Voiced bilabial plosive

The shift from the voiceless bilabial stop [p] to its voiced counterpart [b] is a classic example of voicing lenition, exemplified in both Romance and Uralic historical phonology. In Romance, it occurs in intervocalic positions where the stop adopts the voicing of surrounding vowels. In Uralic (esp. Finnish), it represents the weak grade of consonant gradation, a grammaticalized alternation affecting stops following stressed vowels in closed syllables.

Phonetic Effects

Voicing, Lenition

Language Examples

lupus→lobo [b]— Latin intervocalic [p] voices to [b] in Spanish.
capra→cabra [b]— Latin [p] before [r] voices to [b] in Spanish.
sapere→savoir [v]— French historical voicing [p] > [b], then further lenition to [v].
p→b— Intervocalic voicing: single voiceless stops are realized as voiced when between vowels (e.g., /p/ → [b]).
Finnish rapa (rough)→ravan (GEN)— Consonant gradation weak grade: word-medial /p/ voices to [b] in closed syllable context.
Finnish lipu (flag)→lipun (GEN)— Systematic intervocalic voicing in weak grade: /p/ → [b] when in weak-grade position of the consonant gradation alternation.
p→b— Intervocalic voicing: /p/ is realized as [b] between voiced sounds (e.g., 'bibimbap' [pibimdap]).
/p/→[b]— Ainu voicing of obstruents: /p/ becomes voiced [b] in intervocalic position and after nasals. E.g., /p/ → [b] between vowels, and /np/ → [mb]. This represents conditioned allophonic variation in Ainu's relatively simple consonant system.

Related Transformations

More Romance Shifts

Sources & References

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