HSK 7-9
不辞而别
bùcí’érbiéto leave without saying good-bye
他不辞而别让朋友很担心。
Tā bù cí ér bié ràng péng you hěn dān xīn.
His leaving without saying goodbye worried his friends.
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Appears across levels (7-9) in the HSK 3.0 word list.