δια-πτύσσω · dia-ptyssō — LSJ
open and spread out, unfold, disclose: metaph., διαπτυχθέντες ὤφθησαν κενοί S. Ant. 709, cf. E. Hipp. 985, Pl. Lg. 858e (Pass.); σύμβολα Iamb. Protr. 21; λόγῳ δ. MoschioTrag. 6.
split open, κράνος D.S. 17.20; open up, τὸ ἐπιγάστριον Gal. 2.520.
fold one with another, intertwine, Arist. GA 720b17.