χάριν ἔχειν
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 > English (Woodhouse)
be grateful to, be obliged to, feel gratitude to, feel gratitude, owe thanks to