sideways
From LSJ
μεγάλα ὠφελήσεσθε πρὸς ἱστορίαν τῶν κοινῶν → that will be of great benefit to you in order to understand public affairs
μεγάλα ὠφελήσεσθε πρὸς ἱστορίαν τῶν κοινῶν → that will be of great benefit to you in order to understand public affairs
adv.
P. εἰς πλάγιον, εἰς πλάγια.
Look at a thing side-ways: P. ἐκ πλαγίου θεᾶσθαί τι (Plat., Rep. 598A).