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to happen to meet; to come across; to run into; to bump into
旅先で思いがけず旧友に出くわすこともある。
You sometimes unexpectedly run into old friends while traveling.
駅で偶然先生に出くわした。
I unexpectedly ran into my teacher at the station.
路地裏で野良犬の群れに出くわして怖い思いをした。
I ran into a pack of stray dogs in an alley and had a frightening experience.