American English at State - It's Earth Day, so let's celebrate with idioms related to trees. Which is your favorite? #AmericanEnglish #EarthDay2017 | Facebook
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Dictionary of English Colloquial Idioms by Frederick T. Wood and Robert J. Hill (1979, Book) for sale online | eBay
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Idiom Land on X: "Hey everybody! Our #idiom of the day is ”Knock on wood,” which is said in order to avoid bad luck. Special offer! Get 40% off our idiom dictionary
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