Definitions
1.nounA children's play area consisting of a box filled with sand.
2.nounA box filled with sand that is shaped to form a mould for metal casting.
3.nounA container for sand or pounce, used historically before blotting paper.
4.nounAn animal's litter box.
5.nounA box carried on locomotives, from which sand runs onto the rails in front of the driving wheels, to prevent slipping.
6.nounAn isolated area where a program can be executed with a restricted portion of the resources available."Running a program in a sandbox can prevent it from doing any damage to the system."
7.noun(Wiktionary and WMF jargon) A page on a wiki where users are free to experiment without destroying or damaging any legitimate content.
8.noun(usually "The Sandbox") The Middle East.