Canary in a Coal Mine

Welcome to English in a minute!Canaries are little yellow birds.Canary in a coal mine.Why are these cute birds in a dark coal mine?Did you hear about Sarah?The boss took her to dinner and then fired her the next day.The same thing happened to Jason.The boss took him to dinner and then fired him!Dinner with the boss is like a canary a coal mine.The expression canary in a coal mine is used as a warning.If a canary breathes poisonous gases,it gets sick and dies more quickly than a human would.Coal miners used to bring these birds into the mines with them.If the canaries died,the miners knew the air was not healthy.And that’s English in a minute.

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