Definition of "black out"

Seigel was able to send two post cards home in 44 months via the Red Cross. The first one was completely blacked out by the Japanese censor's pen. The second one he sent, Seigel wrote that he weighed his "usual weight of 130". Seigel's usual weight was 230 so the family could see that he had been severely starved while in captivity. Seigel had at least triumphed over the Japanese censor and his black pen.

2006, Calton Lewis, Wake Island: The Story of a Civilian Pow at Niigata, Japan 1941-1945

I have blacked out your television, every station in the world is mine.

1979, Chris de Burgh (lyrics and music), “The Devil's Eye”, in Crusader

At times, README.txt is vague; some sections have been blacked out, presumably on legal advice.

2022 October 27, Simon Parkin, “README.txt by Chelsea Manning review – secrets and spies”, in The Guardian‎

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 June 3, Charles A. Lindbergh, The Wartime Journals of Charles A. Lindbergh, New York: Harcourt Brace Jovanovich, published 1970, page 839

And they were not surprised when Tang Ya reeled into the mess, his face livid and drawn with pain. Rip and Dane got him to his cabin before he blacked out. But all they could learn from him during the interval before he lost consciousness was that his head was bursting and he couldn't stand it. Over his limp body they stared at one another bleakly.

1956, Andre Norton, Plague Ship

Bleak darkness was blacking out the sea and jungle when Rainsford sighted the lights. He came upon them as he turned a crook in the coast line; and his first thought was that be had come upon a village, for there were many lights.

1924, Richard Connell, The Most Dangerous Game

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, Margery Allingham, chapter 14, in The China Governess‎

The Venetian blinds and the drapes, she thought, would completely black out the room from the ocean side.

1943 May 10, “Press Serial Story: Girl In A Blackout”, in Pittsburgh Press