Proto-Tungus-Manchu: *b[ü]lkü-
Meaning: 1 to soak, wet 2 to splash, swash
Russian meaning: 1 смочить, намочить 2 плескаться, бить ключом
Evenki: bilki- 1, bulkiw- 2
Literary Manchu: bulχu- 2
Nanai: bịlχo- 1, bolqo- ~ bulχo- 2
Udighe: beäku- 1
Comments: ТМС 1, 82, 108. The vocalism is not quite clear because of the doublets with -i- and -u- (due to interdialectal borrowing and perhaps also Mongolian influence, see below).
