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

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 Learners Dictionary & Thesaurus © Cambridge University Press)
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