ὑποίγνυμι
From LSJ
Μεγάλοι δὲ λόγοι μεγάλας πληγὰς τῶν ὑπεραύχων ἀποτίσαντες γήρᾳ τὸ φρονεῖν ἐδίδαξαν → The great words of the arrogant pay the penalty by suffering great blows, and teach one to reason in old age
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.