óspiti comes from the preposition (é)os ‘until’ and the temporal adverb póte ‘when’ (Stergellis 2017). In some areas (e.g. Pamfila, Thermi), it appears as ósputi.
E.g. téʎusé-tu óspiti na értu.
téliosè-to éos-pόte na érθο.
‘Finish it until I come back’