Proto-IE: *op- <PIH *o->
Meaning: back, around
Hittite: appan (Adv.) 'hinten, danach', appanda 'rückwärts, nach', apezzi(ja)- 'hinterer, letzter; gering' (Tischler 41-42, 44)
Old Indian: ápi (+ loc.) 'near, over'; ápāka- `coming from a distant place, distant'
Avestan: aipi (+ acc.) 'über - hin'
Old Greek: ópisthe(n), hom. ópithe adv. 'hinten, hinter'; epí praep. 'upon, etc.'
Latin: op-eriō, ob, usw.
Russ. meaning: сзади, вокруг
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