Wurdahuzdą: Proto-Germanic dictionary — *-u Scott K. Shay Wardja Press https://protogermanic.org/pgmc_u

Single-entry extract from the dictionary. Cross-references to other entries point to their identifiers in the full dictionary.

 Lexikon der indogermanischen Partikeln und Pronominalstämme George E. Dunkel Universitätsverlag Winter 2 2014 Zur Umfunktionierung von UND und ODER zu Fragesatzpartikeln im Litauischen Rosemarie Lühr Linguistica Baltica 4 119–130 1995 αὖ
aû
again, furthermore *-we or wa but, yet *h₂o/u/i thereby, in addition; and; also उ
u
and, also -𐌿
-u
added to the end of a word in a phrase (usually the first word) to make it a question.
-u u ᚢ
particle enclitic question particle marking a polar or alternative/binary question Probably from pre-Germanic *-u, from Proto-Indo-European enclitic *h₂u, a clitic variant of the additive/coordinating particle *h₂o/u/i. Dunkel 2014: 334–345 compares Vedic Sanskrit उ and Ancient Greek αὖ, from an originally coordinative formation. The interrogative function is secondary: an additive or sentence-connecting enclitic ‘and, also, in addition’ was refunctionalized as a marker of an added, potentially alternative proposition, and then as a general polar-question marker. Dunkel explicitly compares Lühr’s 1995: 119–30 Lithuanian development, where inherited conjunctions meaning ‘or’ and ‘and’ were reanalyzed as question particles. An alternative derivation from PIE *-we remains semantically attractive, since Gothic -𐌿occurs in binary questions, but it is formally and morphologically less economical. Dunkel 2014: 845–48 reconstructs *-we as a separate enclitic disjunctive particle with reflexes such as Latin -ve, Vedic वा (vā), Gaulish -ue, and Ancient Greek ἤ (ḗ), all meaning ‘or’, and Tocharian B wa; deriving Proto-Germanic *-u from this particle would separate it from *-uh, which Dunkel derives from *h₂u-kʷe, and would require an additional account of the loss or remodeling of *w-. Usage Note

This suffix was used in yes/no questions and to present a binary choice between two options. It was a clitic attached to the end of the first word in a clause, often a verb, but also between a preverb and a verb or between a preposition and a noun.
Gothic -𐌿 (-u)