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According to philologist Robert Claiborne, the US Weather Bureau defines it as: "a cumulonimbus that can reach 40,000 feet high." What two-word cliche is it?

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Answer: cloud nine

In Loose Cannons and Red Herrings, Claiborne implies that the Bureau's definition led to this figure of speech. However, Merriam-Webster states that the term derives from the name of the highest heaven in Dante's Paradise.

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