"whiteout" in the noun sense
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
"whiteout" in the verb sense
1. whiteout, white out
cover up with a liquid correction fluid
"white-out the typo"
2. white-out, whiteout
lose daylight visibility in heavy fog, snow, or rain
Source: WordNet® (An amazing lexical database of English)
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