sài​wēng​shī​mǎ'ān​zhī​fēi​fú

blessing in disguise

塞翁失马安知非福 (塞翁失馬安知非福) sài​wēng​shī​mǎ'ān​zhī​fēi​fú
blessing in disguise
A setback or misfortune that may eventually result in a positive outcome; based on the idiom of the old man losing his horse which later brought a better result.

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Definitions
CC-CEDICT