black box
noun/ˌblæk ˈbɒks/
/ˌblæk ˈbɑːks/
- (also flight recorder)a small machine in a plane that records all the details of each flight and is useful for finding out the cause of an accidentTopics Transport by airc2
- [usually singular] (informal) a complicated piece of equipment, usually electronic, that you know produces particular results, but that you do not completely understand
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black box