ῥύσια
From LSJ
ἐν πιθήκοις ὄντα δεῖ εἶναι πίθηκον → in Rome we do as the Romans do | when in Rome, do as the Romans do | when in Rome, do as the Romans | when in Rome, do like the Romans do | when in Rome | being among monkeys one has to be a monkey
Greek (Liddell-Scott)
ῥύσια: «ἐνέχυρα· καὶ ῥυσιάζεσθαι· τὸ ἐνεχυριάζειν» Φώτ.