Proto-Altaic: *ǯā́p`V
Meaning: crack, interstice
Russian meaning: щель, промежуток
Comments: ТМС 1, 251, АПиПЯЯ 293. A Western isogloss. For the semantics in Turkic cf. the TM derivatives: *ǯap-ku 'afflux, influx' (ТМС 1, 251), Man. ǯajfan 'place where rivers meet' (ТМС 1, 241); a foreign source for *jāp is, however, also not excluded.