hay que impedir
From LSJ
κορυδός ἐν ἀμούσοις φθέγγεται → a lark sings amid the songless | in the land of the blind, the one-eyed man is king | in the country of the blind, the one-eyed man is king | in the valley of the blind, the one-eyed man is king
εἰρκτέον, ἀποκωλυτέον, διακωλυτέον, ἀντικωλυτέον