τού
From LSJ
τὸ δ' ἐξαίφνης τὸ ἐν ἀναισθήτῳ χρόνῳ διὰ μικρότητα ἐκστάν → suddenly refers to what has departed from its former condition in a time imperceptible because of its smallness
English (LSJ)
τούγα, τούν, τούνη, v. σύ.
Greek Monotonic
τού: Βοιωτ. αντί σύ, το Λατ. tu, thou.
German (Pape)
böot. statt σύ, Apoll.Dysc.