The equivalents of the English saying "That's Greek to me" are "This appears to be Spanish" (German), "This is Chinese to me" (Dutch), "It's German to me" (Philippines), "It's Hebrew" (Finnish), "It's Chinese to me" (Hebrew), "Sounds like Mars language/These are chicken intestines" (China).
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The P.S. at the end of a letter stands for Post Script.
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The word "impossible" dropped in use by 50% over the course of the 20th century
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'⸮' is a punctuation mark that was first proposed in the 1580s to denote sarcasm or irony.
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The technical term for a cat’s hairball is a “bezoar.”
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If you mouth the word "colorful" to someone, it looks like you are saying "I love you".
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The word "clitoris" comes from the Greek word meaning "side of a hill".
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