πλατύ

From LSJ

ὁ δὲ πείσεται εἰς ἀγαθόν περ → he will obey you to his profit, he will obey you for his own good end

Source

Russian (Dvoretsky)

πλᾰτύ:
I n к πλατύς.
II τό открытое место, равнина Xen.
III adv. широко, т. е. раскатисто, громко (καταχρέμψασθαι Arph.).