önünde sonunda

• önü sonu (colloquial)
• eninde sonunda (nonstandard, now more common)

From ön (“front, beginning”) +‎ -ü (possessive suffix) +‎ -(n)de (locative suffix with "n" as buffer consonant) +‎ son (“end, last, furthermost”) +‎ -u (possessive suffix) +‎ -(n)da (locative suffix with "n" as buffer consonant), literally “at the beginning or at the end”.

• IPA^(key): /œ.nynˈde.so.nun.da/
• Hyphenation: ö‧nün‧de‧so‧nun‧da

önünde sonunda

1. (idiomatic) sooner or later, eventually

   Synonyms: er geç, er ya da geç, sonunda, (archaic) evvel ahir

• “önünde sonunda”, in Turkish dictionaries, Türk Dil Kurumu