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From Proto-Balto-Slavic *kanˀstei from an earlier form **kanˀdtei .
Per Vasmer, derived from *kǫ̑sъ ( “ piece ” ) ; but per Trubachev, the noun is derived from the verb. Cognate with Lithuanian ką́sti ( “ to bite ” ) (1sg. kándu ), Latvian kuôst ( “ to bite ” ) (1sg. kuôžu ). Possibly cognate with some or all of Ancient Greek κνώδων ( knṓdōn , “ knife, blade, prong ” ) , κνώδαλον ( knṓdalon , “ wild beast ” ) , Old High German hantag ( “ sharp, cutting ” ) , Sanskrit खादति ( khā́dati , “ to chew, to bite ” ) , Persian خاییدن ( xâyidan , “ to chew ” ) , Old Armenian խածանեմ ( xacanem , “ to bite ” ) . Per Derksen, from Proto-Balto-Slavic *kanˀd- , from which a Proto-Indo-European root such as *k(ʷ)end- or *k(ʷ)enHd(ʰ)- can be constructed; he adduces the Sanskrit and Armenian terms mentioned earlier as cognates.[ 1]
*kǫsàti impf [ 1] [ 2]
to bite
Conjugation of
*kǫsati, *kǫsa, *kǫsajetь (
impf. ,
-a- , s-aorist, accent paradigm ?)
Verbal noun
Infinitive
Supine
L-participle
*kǫsanьje
*kǫsati
*kǫsatъ
*kǫsalъ
Participles
Tense
Past
Present
Passive
*kǫsanъ
*kǫsajemъ
Active
*kǫsavъ
*kǫsaję
Aorist
Present
Person
1st
2nd
3rd
1st
2nd
3rd
Singular
*kǫsaxъ
*kǫsa
*kǫsa
*kǫsajǫ
*kǫsaješi
*kǫsajetь
Dual
*kǫsaxově
*kǫsasta
*kǫsaste
*kǫsajevě
*kǫsajeta
*kǫsajete
Plural
*kǫsaxomъ
*kǫsaste
*kǫsašę
*kǫsajemъ
*kǫsajete
*kǫsajǫtь
Imperfect
Imperative
Person
1st
2nd
3rd
1st
2nd
3rd
Singular
*kǫsaaxъ
*kǫsaaše
*kǫsaaše
—
*kǫsaji
*kǫsaji
Dual
*kǫsaaxově
*kǫsaašeta
*kǫsaašete
*kǫsajivě
*kǫsajita
—
Plural
*kǫsaaxomъ
*kǫsaašete
*kǫsaaxǫ
*kǫsajimъ
*kǫsajite
—
East Slavic:
South Slavic:
West Slavic:
Vasmer, Max (1964–1973 ), “куса́ть ”, in Oleg Trubachyov , transl., Этимологический словарь русского языка [Etymological Dictionary of the Russian Language ] (in Russian), Moscow: Progress
Vasmer, Max (1964–1973 ), “кус ”, in Oleg Trubachyov , transl., Этимологический словарь русского языка [Etymological Dictionary of the Russian Language ] (in Russian), Moscow: Progress
Trubachyov, Oleg , editor (1985 ), “*kǫsati ”, in Этимологический словарь славянских языков [Etymological dictionary of Slavic languages ] (in Russian), numbers 12 (*koulъkъ – *kroma/*kromъ ), Moscow: Nauka, page 65
↑ 1.0 1.1 Derksen, Rick (2008 ), “*kǫsati”, in Etymological Dictionary of the Slavic Inherited Lexicon (Leiden Indo-European Etymological Dictionary Series; 4), Leiden; Boston: Brill, →ISBN , page 243 : “v. ‘bite’ ”
^ Snoj, Marko (2016 ), “kọ̑s ”, in Slovenski etimološki slovar [Slovenian Etymology Dictionary ] (in Slovene), 3rd edition, https://fran.si : “*kǫsa̋ti ”