μὴ δὶς πρὸς τὸν αὐτὸν λίθον πταίειν → do not stumble twice on the same stone
v. κατέπεφνον.
καταπεφνεῑν defect. aor., 1 massacre κατὰ μὲν φίλα τέκν' ἔπεφνεν fr. 171.