sandbox >> ˈsan(d)bɒks
Definition: [noun] a shallow box or hollow in the ground partly filled with sand for children to play in; a sandpit.
Definition: [noun] a testing environment in a computer system in which new or untested software or coding can be run securely.
Definition: [noun] a box containing sand, especially one kept on a train to hold sand for sprinkling on to slippery rails.
Definition: [noun] a tropical American tree whose seed cases were formerly used to hold sand for blotting ink.
Definition: [verb] isolate (a piece of software) so that it can access only certain resources, programs, and files within a computer system.
Example: the apps you install on your device are sandboxed