郷ごうに入いっては郷ごうに従したがえ

expression

when in Rome, do as the Romans do

Proverb advising to follow the customs of the place you are in.

• 海かい外がいに住すむなら、郷ごうに入いっては郷ごうに従したがえだよ。

  If you live abroad, you should do as the locals do.