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Proto-Athabaskan *də- (valency decrease), from Proto-Na-Dene *də- (signaling valency decrease); cognate with Haida -d-, Eyak -d-, and Tlingit -d- (reflexive suffix).



  1. The -d- classifier or valence-change prefix, a detransitivizing prefix of active verbs that modifies the transitivity or valence and grammatical voice of a verb, occurs in most passive, mediopassive, reflexive, and reciprocal verbs that are derived from verbs with a -Ø- classifier. It produces the agentive passive verb forms.
    -d- + ‎yizéés (he's singeing it) → ‎yidéés (it's being singed)

See also[edit]