noun
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(US, Canada) A children's play area consisting of a box filled with sand.
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A box filled with sand that is shaped to form a mould for metal casting.
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A container for sand or pounce, used historically before blotting paper.
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An animal's litter box.
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(rail transport) A box carried on locomotives, from which sand runs onto the rails in front of the driving wheels, to prevent slipping.
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(computing) An isolated area where a program can be executed with a restricted portion of the resources available.
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(wiki jargon) A page on a wiki where users are free to experiment without destroying or damaging any legitimate content.
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(US, military, slang, usually "The Sandbox") The Middle East.