ὑποίγνυμι
From LSJ
τὸ κακὸν δοκεῖν ποτ' ἐσθλὸν τῷδ' ἔμμεν' ὅτῳ φρένας θεὸς ἄγει πρὸς ἄταν → evil appears as good to him whose mind the god is leading to destruction (Sophocles, Antigone 622f.)
English (LSJ)
A open a little or secretly, τὴν θύραν Ar.Th.424, cf. Ec.15.
German (Pape)
[Seite 1218] u. ὑποίγω (s. οἴγνυμι), heimlich od. sacht, ein wenig öffnen, θύραν Ar. Th. 431.