ὑπόδυσις
From LSJ
νᾶφε καὶ μέμνασ' ἀπιστεῖν → keep a clear head and remember not to believe a thing (Epicharmus fr. 250)
English (LSJ)
εως, ἡ,
A getting under a place, Arist.IA713a20. II retiring place, place of shelter, Agatharch.32, J.BJ3.7.22, Muson.Fr. 14p.71H. III imperceptibility, σφυγμῶν Sor.2.61. IV = submersio, Gloss.