by 
redwing46
ANSWERS: 2
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In the early days, and maybe even now, Punching bags were filled with sand. Pounding sand was a good way to let off steam and get rid of a lot of unwanted animosity without hurting someone.
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The origin of the expression "go pound sand" is from a longer expression, not to know (have enough sense to) pound sand down a rathole. Filling rat holes with sand is menial work, and telling someone to pound sand down a hole is like telling them to go fly a kite. The expression dates to at least 1912 and is common in the midwestern United States. wordorigins.org
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