a black box

black box

1. The device in an airplane that records flight audio and data. Once the black box is recovered from the wreckage, it will give us more insight into what caused the crash.
2. Any sort of system or device with inner workings that are difficult to understand. Does anyone outside of the IT department really understand how this black box works?
See also: black, box
Farlex Dictionary of Idioms.

a black box

You can call a process or system a black box when you know that it produces a particular result but you do not understand how it works. What steroids do is currently something of a black box. The firm's investment success lies in its black box of formulas which identify trends. Note: In an electronic or computer system, a black box is a self-contained part. You can understand its function without knowing anything about how it works.
See also: black, box
Collins COBUILD Idioms Dictionary, 3rd ed.
See also:
  • black box
  • mix (something) down
  • mix down
  • experiment
  • experiment (up)on (someone or something)
  • experiment on
  • record on
  • record on (something)
  • joe job
  • here's the thing (about someone or something)
References in periodicals archive
"The malarial genome has been a black box. Our technique allows us to open that box, so that we can learn what genes in the most lethal human parasite actually do," said Dennis Voelker, PhD, Professor of Medicine at National Jewish Health and senior author on the paper.