black out

verb6

1. •
   To obscure in darkness.

   • Nanny Broome was looking up at the outer wall. Just under the ceiling there were three lunette windows, heavily barred and blacked out in the normal way by centuries of grime. — 1963
2. •
   To lose consciousness; to suffer a blackout.

   • I am blacking out—ease the stick forward slightly—the sky is clear again—I turn out over water—reverse turn—there are antiaircraft on the island below—I reverse again—and again. — 1944
3. •
   To cause (someone) to lose consciousness.
4. •
   To censor or cover up by writing over with black ink.
5. •
   (figurative) To censor or cover up.

   • I have blacked out your television, every station in the world is mine. — 1979
6. •
   To be in a state of blackout, as a building, a city, a ship.

   • The countryside blacked out to avoid helping enemy aircraft.