From Wiktionary, the free dictionary
Literally, “[a] misfortune is good for something”.
- IPA(key): /a kɛl.k(ə) ʃoz ma.lœʁ ɛ bɔ̃/
à quelque chose malheur est bon
- every cloud has a silver lining; it's an ill wind that blows no one any good (even a bad situation conceals some benefit)