a box or receptacle for holding sand, especially one large enough for children to play in.

1565–75; sand + box1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sandbox (ˈsændˌbɒks)
1.  a container on a railway locomotive from which sand is released onto the rails to assist the traction
2.  a box with sand shaped for moulding metal
3.  a container of sand for small children to play in
4.  computing a protected environment in which an untrusted program may be run without affecting other parts of the system

Collins English Dictionary - Complete & Unabridged 10th Edition
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