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Douglas Harper's Etymology Dictionary
white-out

1946 as an extreme snow condition on the U.S. prairie, from white as a verb + out (adv.). From 1977 as a liquid correction for paper.

Wiktionary
white-out

n. (alternative spelling of whiteout English)

WordNet
white-out
  1. v. cover up with white-out; "white-out the typo"

  2. lose daylight visibility in heavy fog, snow, or rain

  3. widen the interlinear spacing by inserting leads

Usage examples of "white-out".

One through Nine, came in fragmentarily before the curtain of noise became an opaque white-out.

Even though I remember Matt Lauer, Al Gore, Michael Jordan, Batman, Web sites, Turkey Hills, cineplexes, Solo cups, Nintendo, White-Out, CD-ROM, heroin chic and guns, I don't know where they all went.

If I'm right about her, then there ought to be blanks on the tape corresponding with the white-outs surrounding the terrorist incidents.