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English word dusk comes from Proto-Indo-European *dʰewh₂-, and later Proto-Germanic *duskaz (Dark, dark-colored, dusky.)
*dʰewh₂- (Proto-Indo-European)
to rise in smoke
*dʰwes- (Proto-Indo-European)
*dʰuskos (Proto-Indo-European)
*duskaz (Proto-Germanic)
Dark, dark-colored, dusky.
dox (Old English)
duske (Middle English)
dusk (English)
(intransitive) To begin to lose light or whiteness; to grow dusk.. (transitive) To make dusk. Tending to darkness or blackness; moderately dark or black; dusky. A darkish colour.. A period of time at the end of day when the sun is below the horizon but before the full onset of night, especially the darker part of twilight.