[d]→[ʈ]Certainty: 5/5Commonality: 3/5

Retroflexion Sandhi Assimilation Rhotacism Germanic Indo-Aryan Tibetic Dravidian

Voiced alveolar plosive to Voiceless retroflex stop

The shift from an alveolar or dental stop [d] to a retroflex stop (like [ɖ] or [ʈ]) typically occurs when the consonant is influenced by an adjacent rhotic sound [r] or through specific historical substrate influences. The tongue tip curls back further into the mouth.

Phonetic Effects

Retroflexion, Sandhi Assimilation

Language Examples

Lhasa Tibetan (from Classical tr- clusters) Tibetic

Classical Tibetan dr- consonant clusters (subjoined -r)→Modern Lhasa Tibetan ɖ [tʂ] or ɖʰ [tʂʰ]— Historical rhotacism: subjoined r with dental stops created modern retroflex affricates. Classical dr → Lhasa tʂ (shown in orthographic 'dr' notation).

Tamil / Telugu (Dravidian) Dravidian

dental d [d̪]→retroflex ḍ [ɖ]— Proto-Dravidian *ḍ is a reconstructed retroflex stop. Tamil ட between vowels is voiced [ɖ]; e.g., 'aṭai' (room) shows retroflex [ɖ]. Kannada 'haḍa' (bald) shows ḍ contrasting with 'd'.

Swedish Germanic

bord [buːrd]→[buːɖ]— Supradental/retroflex assimilation: /r/ + /d/ cluster merges into a single voiced retroflex stop [ɖ] in connected speech.

nord [nuːrd]→[nuːɖ]

Sanskrit Indo-Aryan

*ni-sd-os (PIE 'nest')→nīḍá- [ɖ]— RUKI/sibilant-triggered retroflexion: *sd → Sanskrit ḍ (voiced retroflex stop).

Related Transformations

Reverse

More Germanic Shifts

[a] → [ã] — Assimilatory Nasalization [a] → [∅] — Elision [a] → [ʔ] — Glottalization [a] → [ə] — Vowel Reduction [ai] → [e] — Monophthongization

Sources & References

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