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to happen to meet; to come across; to run into; to bump into
旅先で偶然にも旧友に出交して驚いた。
I was surprised to run into an old friend by chance while traveling.
駅前で同僚に出交して一緒に帰ることにした。
I ran into a colleague in front of the station and we decided to go home together.
買い物中に知人に出交すことがよくある。
I often run into acquaintances while shopping.