DICT.TW Dictionary Taiwan

 whiteout
      n : an arctic atmospheric condition with clouds over snow
          produce a uniform whiteness and objects are difficult to
          see; occurs when the light reflected off the snow equals
          the light coming through the clouds

 white-out
      v 1: 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