Etymology
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sandbox (n.)

also sand-box, 1570s as a perforated device to sprinkle sand, from sand (n.) + box (n.1). From 1680s as "a box holding sand." In U.S. locomotives, "a device to put sand on the rails when wet wheels slip" (by 1849). By 1891 as a low-sided sand-pit for children's play.

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