Meaning of “when in Rome (do as the Romans do)” in the English Dictionary

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"when in Rome (do as the Romans do)" in British English

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when in Rome (do as the Romans do)

something that you say that means that when you are visiting another country, you should behave like the people in that country:

I don't drink wine usually but on holiday, well, when in Rome...

(Definition of “when in Rome (do as the Romans do)” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)