sand·pit (s?nd?p?t?)n. A large deep pit in sandy ground from which sand is dug.American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.sandpit (?sænd?p?t) n1. a shallow pit or container holding sand for children to play in2. (Mining & Quarrying) a pit from which sand is extracted3. (Mining & Quarrying) an event organized by a governmental body, business enterprise, etc at which specialists from a wide range of disciplines are brought together to try to find a balanced solution to a given problemCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014sandpitsandboxDictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited