white·out /ˈhwaɪtˌaʊt, ˈwaɪt-/
  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