canary in a coal mine

英語（米国） (en-US) 英語（イギリス） (en-GB)

名詞

慣用表現

(idiomatic) Something whose sensitivity to adverse conditions makes it a useful early indicator of such conditions; something which warns of the coming of greater danger or trouble by a deterioration in its health or welfare.

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The stray complaints from early users were a canary in a coal mine for the product team.

詳細

意味（1）

(idiomatic) Something whose sensitivity to adverse conditions makes it a useful early indicator of such conditions; something which warns of the coming of greater danger or trouble by a deterioration in its health or welfare.

A mussel is a canary in a coal mine, Clemens explained. When the freshwater mussels are healthy, it indicates good water quality.

詳細

canaries in a coal mine （ plural ）

canaries in coal mines （ plural ）