From Longman Dictionary of Contemporary Englishsandpitsand‧pit /ˈsændˌpɪt/ noun [countable] British English DGOa box or special area filled with sand for children to play in SYN sandbox American English
Examples from the Corpus
sandpit• Always cover a sandpit or the local cats will use it as a toilet.• Because she had no garden, she improvised a sandpit for the children to play in.• He forces all the others to live in a sandpit of their own digging.• A child's garden can be so much more than just a sandpit.• Don't forget ... If you leave a sandpit or pool out for a while, the grass underneath will die.• It looked like a sandpit with some colored dirt mixed in.• Her eyesight was vague and muzzy, her mouth felt like the bottom of a sandpit. 