ἐρύεσθαι

From LSJ

νέῳ δὲ σιγᾶν μᾶλλον ἢ λαλεῖν πρέπει → it's fitting for a young man to keep silence rather than to speak (Menander)

Source

French (Bailly abrégé)

inf. f. Moy. épq. (p. ἐρύσεσθαι) de ἐρύω.