Meaning of 不幸中の幸い in Japanese

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Definition of 不幸中の幸い

ふこうちゅうのさいわい(fukouchuunosaiwai) 【不幸中の幸い】

(exp) small mercy (from some misfortune); silver lining of a dark cloud; consolation in sadness; blessing in disguise

だれにも死亡しぼうがなかったのは不幸中の幸いふこうちゅうのさいわいでした。

It is a consolation that no one was killed.

「腰こしは痛むいたむ？」「いやいいえ、別にべつに」「そう、それは不幸中の幸いふこうちゅうのさいわいね」

"Does your back hurt?" "No, not really." "Oh, that's something then, isn't it?"