Making a round trip; going somewhere and then returning (coming and going).
東京まで往復で4時間かかった。
It took four hours round-trip to Tokyo.
毎日、会社まで往復30分歩いている。
I walk 30 minutes round-trip to the company every day.
出張で大阪へ往復した。
I made a round trip to Osaka on a business trip.
Abbreviated usage: a round-trip (return) ticket — a ticket covering both outward and return journeys.
切符売り場で『往復でお願いします』と言った。
I said at the ticket counter, 'A round-trip, please.'
往復切符を買うと割引になることが多い。
Buying a round-trip ticket is often discounted.
Correspondence: exchanging letters or messages back and forth.
学生時代、彼とは往復で手紙を交わした。
When I was a student, I exchanged letters back and forth with him.
Visiting each other / socializing: keeping company by going back and forth between places or people.
近所の家々と往復してお祝いを手伝った。
We went back and forth between neighboring houses to help with the celebrations.
離れた親戚と往復して世話をし合った。
We visited each other back and forth with distant relatives and helped one another.