"Pound sand" = a colloquial expression meaning engage in a futile activity.
Similar to "push on a rope".
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No. He died after 15 days trapped by a 27 pound rock on his foot.
"Off you go" is not grammatically incorrect.
1990
Go to a park that has sand and maybe you will see a kid in a sandbox!!
A hill of sand in a desert is normally referred to as a dune