ὦσι

From LSJ

ἐφ' ἁρμαμαξῶν μαλθακῶς κατακείμενοι → reclining softly on litters, reclining luxuriously in covered carriages

Source

French (Bailly abrégé)

3ᵉ pl. sbj. prés. de εἰμί.

Russian (Dvoretsky)

ὦσι: 3 л. pl. praes. conjct. к εἰμί.