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@johnjhorton I never thought of it as a particularly card-associated term (though I know its use there)… quick Google suggests disputed origin—maybe the sandbags were used to equalize required effort, or else to attack shirkers? quora.com/What-is-the-origin-and-meaning-of-the-term-sandbagging?ch=17&oid=34239819&share=01d22f15&srid=uj8f&target_type=question
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