不翼而飞 Save Sign in to save words Traditional (Taiwan): 不翼而飛 On the HSK 7-9 vocabulary list, at CEFR level C2. bùyìérfēi ㄅㄨˋ ㄧˋ ㄦˊ ㄈㄟ to disappear without trace to vanish all of a sudden to spread fast to spread like wildfire Character by character 不(bù)no 翼(yì)wing 而(ér)and 飞(fēi)fly A Chinese word or character, or English Search Sources CC-CEDICT, CC BY-SA 4.0 pinyinjs, Apache-2.0 国际中文教育中文水平等级标准, 中华人民共和国教育部, MIT