<p><strong>Noun:</strong></p><ul><li>a box or receptacle for holding sand, especially one large enough for children to play in</li><li>an environment in which software developers or editors can create and test new content, separate from other content in the project (often used attributively): sandbox web design; new features are tested and critiqued in the demo sandbox</li></ul><p><strong>Adjective:</strong></p><ul><li>noting or relating to a genre of video game with a nonlinear structure that allows players to roam freely</li></ul>