why is one thousand dollars referred to as a " grand "
I believe that the first written proof was in the early 1900's, 1915 to be exact when a 1,000.00 was regarded as a "grand" sum of money. After WWII, I think that a grand sum was also an adopted "coined phrase" ( he,hee-coined) that came over from England in relation to money.
Yes, the etymology of this colloquialism dates back to the early 1900's from a grand sum of money. I believe the first recorded slang version is Amer, not British but I could be wrong.
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