-у

From Proto-Turkic *-g. Cognate to Kyrgyz -уу (-uu) / -үү (-üü), Southern Altai -у (-u) / -ӱ (-ü), etc.

-у • (-u)

1. Used to form verbal nouns from verbs.

   ‎же- (je-, “eat”) + ‎-у (-u) → ‎жеу (jeu, “eating, to eat”)

• -ю (-ju)

• -у: IPA^(key): [ʊ]
• -у́: IPA^(key): [ˈu]

-у • (-u)

1. Accusative case suffix for feminine nouns ending with -а or -я.

   ‎глава́ (glavá, “head”) + ‎-у́ (-ú) → ‎главу́ (glavú, “head-ACC”)

Lusin, Natalia. 1992. Russian Grammar. Nouns. 42. N.Y.: Barron's Educational Series, Inc.

From accusative case singular desinence (hard feminine form) -у m or f (-u, suffix form). Compare Russian -у (-u, 'суффикс I' at ruwiktionary under «Русский») .

-у • (-u)

1. Adverbial; forms quantitative adverbs from nouns and adjectives, often prefixed: indicates qualitative degree of intensity of the base word

   ‎за- (za-) + ‎молодий (molodyj) + ‎-у (-u) → ‎замолоду (zamolodu)

See the etymology of the corresponding lemma form.

-у • (-u) f or m (variant -ю)

1. accusative singular of -а (-a)

-у • (-u) (variant -ю)

1. accusative feminine singular of -ий (-yj)

-у • (-u) m

1. _non-ar/-j genitive/dative/locative/vocative singular of -∅
2. _-ar-stem dative/locative singular of -∅

• “у”, in Горох – Словозміна [Horox – Slovozmina, Horokh – Inflection]‎^[1]