vo : [enclitic from tumha] to you; of you; by you.

A.P. Buddhadatta Mahathera, Concise Pali-English and English-Pali Dictionary [available as digital version from Metta Net, Sri Lanka]

Vo1 (indecl.) a particle of emphasis, perhaps=eva, or =vo2 (as dative of interest). The Commentaries explain it as "nipāta," i. e. particle. Thus at Sn 560, 760.

Pali-English Dictionary, TW Rhys Davids, William Stede,

Vo2 [cp. Vedic vaḥ, Av. vō, Lat. vos, Gr. u)/mme] is enclitic form of tumhe (see under tuvaŋ), i. e. to you, of you; but it is generally interpreted by the C. as "nipāta," i. e. particle (of emphasis or exclamation; i. e. vo1). Thus e. g. at Pv i.53 (cp. PvA 26).

Pali-English Dictionary, TW Rhys Davids, William Stede,

Vo˚ is commonly regarded as the prefix combn vi+ava˚ (i. e. vi+o˚), but in many cases it simply represents ava˚ (=o˚) with v as euphonic ("vorschlag"), as in vonata (=onata), voloketi, vokkanti, vokiṇṇa, voropeti, vosāpeti, vosāna, vossagga. In a few cases it corresponds to vi+ud˚, as in vokkamati, vocchijjati, voyoga.

Pali-English Dictionary, TW Rhys Davids, William Stede,