Word: 不翼而飞 (bùyìérfēi) Traditional: 不翼而飛 不翼而飞 dictionary entry bùyìérfēi to disappear without trace; to vanish all of a sudden; to spread fast; to spread like wildfire Full dictionary entry for 不翼而飞 Example sentences using 不翼而飞 2 sentences, showing page 1 of 1. 冰箱里的蛋糕一夜之间不翼而飞。 Bīngxiāng lǐ de dàngāo yíyèzhījiān búyì'érfēi. The cake in the fridge vanished overnight. 刚买的雨伞怎么不翼而飞了？ Gāng mǎi de yǔsǎn zěnme búyì'érfēi le? How did the umbrella I just bought disappear all of a sudden?