ἀναβάδην
From LSJ
αἰθὴρ δ᾽ ἐλαφραῖς πτερύγων ῥιπαῖς ὑποσυρίζει (Aeschylus, Prometheus Bound 126) → The bright air fanned | whistles and shrills with rapid beat of wings.
English (LSJ)
[βᾰ], Adv., (ἀναβαίνω) lit.
A going up, but usu. with one's feet up, lying down, Ar.Pl.1123, D.Chr.62.6, Plu.2.336c, cf. Ath.12.528f, Poll.3.90; so prob. in Ar.Ach.399,410, but expl. by a Sch. as upstairs.