不翼而飞 Traditional 不翼而飛 bù yì ér fēi 🔊 to disappear without trace HSK 7–9 + Keep this word Meanings bù yì ér fēi 不翼而飛 to disappear without traceto vanish all of a suddento spread fastto spread like wildfire Its characters 不bùnot; noHSK 1翼yìwing而érandHSK 4飞fēito flyHSK 2