不期而会
词典meet by chance：偶然遇见；邂逅；邂逅相遇。
词典911查询·英语单词
词典unexpected encounter：不期而会。
1. 晚上九点钟光景，吴公馆里不期而会的来了些至亲好友，慰问吴荪甫在厂里所受的惊吓。 Around nine o'clock that evening, Wu Sun-fu was entertaining A number of friends and relatives who had come to see how he was after his unpleasant experience at the factory gate.