ἀποτραχύνω
From LSJ
μή μοι θεοὺς καλοῦσα βουλεύου κακῶς· πειθαρχία γάρ ἐστι τῆς εὐπραξίας μήτηρ, γυνὴ Σωτῆρος· ὦδ᾽ ἔχει λόγος → When you invoke the gods, do not be ill-advised. For Obedience is the mother of Success, wife of Salvation—as the saying goes.
English (LSJ)
pf.
A ἀποτετράχυκα D.H.Comp.22:—make rough or hard: metaph., τὴν ἁρμογήν l.c.; but ἀ. τὴν ἀκοήν grate on the ear, Id.Dem.43:—Pass., to be or become rough or hard, Thphr.HP6.4.2.