canary in a coal mine
- Canary in a coal mine(UK) A canary in a coal mine is an early warning of danger.
The small dictionary of idiomes. 2014.
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canary in a coal mine — (UK) A canary in a coal mine is an early warning of danger. (Dorking School Dictionary) … English Idioms & idiomatic expressions
canary in a coal mine — noun A warning of danger or trouble yet to come. Syn: miners canary … Wiktionary
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