ɓɨwak num. two deux (5 groups, 14 languages) C syn: tsɨjɨw, sɨwra, kasi.
This is one of a number of roots for 'two' found in Central Chadic. The range of languages where this root is attested implies a reasonable age, but it is more likely that *sɨwra was the Proto-Central Chadic root. The *ɓ has become /b/ in several languages, and a labial-velar double plosive in a few others. These changes are unestablished. The double plosive may be due to the *w merging with *ɓ, which is a known sporadic process. In many cases the *w has been lost sporadically, but in Kamwe-Nkafa it has merged with the *ɓ resulting in /ɓʷ/.

1Proto-Bata *ɓɨjak two deux 1.1) Bata (Boyd) kpjáq two 1.2) Jimi (Djibi) biik Chiffre deux

2Proto-Daba *ɓɨk two deux 2.1) Buwal (Viljoen) gbɑk two (2) deux (2) 2.2) Gavar (Viljoen) gbɑk two (2) deux (2) 2.3) Mbudum (Ndokobaï) bək two (2) deux (2)

3Proto-Sukur *bak two deux 3.1) Sukur (David) bak two

4Proto-Mandara *bɨwa two deux 4.1) Mandara (Fluckiger) bua two deux 4.2) Malgwa (Löhr) buwa two 4.3) Glavda (Nghagyiva) bùːwa two (2)

5Proto-Higi *ɓɨwak two deux 5.1) Kamwe-Nkafa (Harley) ɓʷàgə́ Two 5.2) Kamwe-Futu (Harley) ɓakəo two 5.3) Kirya (Blench) ɓə̀kə̀ two 5.4) Psikye (Angelo) bák two 5.5) Bana (Lienhard) bák(ə) deux

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