Definition of sandboxes:
(n) :
(US, Canada) A children's play area consisting of a box filled with sand.
(n) :
(computing) An isolated area where a program can be executed with a restricted portion of the resources available.
(n) :
(wiki jargon) A page on a wiki where users are free to experiment without destroying or damaging any legitimate content.
(v) :
(computing, transitive) To restrict (a program, etc.) by placing it in a sandbox.
(n) :
A box filled with sand that is shaped to form a mould for metal casting.
(n) :
(rail transport) A box carried on locomotives, from which sand runs onto the rails in front of the driving wheels, to prevent slipping.