when in Rome, do as the Romans do
US /wen ɪn roʊm, duː æz ðə ˈroʊmənz duː/
UK /wen ɪn roʊm, duː æz ðə ˈroʊmənz duː/

1.
When in a foreign place, follow the customs of the people who live there.
:
•
I don't usually eat with my hands, but when in Rome, do as the Romans do.
•
I know it's different from what we do at home, but when in Rome, do as the Romans do.