To fly despite not having wings
To spread like wildfire; to vanish without a trace
Neutral
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[Source]
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不翼而飞 (bù yì ér fēi)
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《管子》(Guǎn Zǐ), a classical book containing writings of the famous Spring and Autumn period politician 管仲 (Guǎn Zhòng, ? - 645 BC)
This chengyu is from a line in the work listed in the "Origin" section above