ἀντιπταίω
From LSJ
τοῦ εἰδέναι χάριν ἡ πραγματεία → knowledge is the object of our inquiry, the aim of our investigation is knowledge
English (LSJ)
A obstruct, stand in the way, πρός τι Onos.17.
Spanish (DGE)
obstaculizar, obstruir πρὸς τὸν ῥόμβον Onas.17.