The compound 'white-out' is a modern formation built from two fundamental Germanic elements. The first, 'white', originates from the Proto-Germanic 'hwītaz', describing the color of light or snow. The second, 'out', derives from Proto-Germanic 'ūt', meaning 'outward' or 'to completion'. The term's logic is transparent: in its primary sense, it denotes the action of using a white substance to completely blot 'out' an error. This literal action of covering up was then metaphorically extended to describe the meteorological phenomenon where falling or blowing snow completely blots 'out' visibility, rendering the landscape a featureless 'white'.

Structure: white (color) + out (complete) 'white' is from Old English 'hwīt', meaning the color white, of Germanic origin. 'out' is from Old English 'ūt', meaning outward, away, or completely, also of Germanic origin.