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sandbox (n.)

also sand-box, 1570s as an instrument to sprinkle sand, from sand (n.) + box (n.1). From 1680s as "a box holding sand;" 1891 as a low-sided sand pit for children's play.

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Definitions of sandbox

sandbox (n.)
mold consisting of a box with sand shaped to mold metal;
sandbox (n.)
a plaything consisting of a pile of sand or a box filled with sand for children to play in;
Synonyms: sandpile / sandpit
From wordnet.princeton.edu