DUSK (2)
Source: 566, 567
dusk (2). Dusk, n. a tendency to darkness or blackness
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Dusk, n. 1. 1. Imperfect obscurity; a middle degree between light and darkness; twilight; as, the dusk of the evening.
2. 2. A darkish color.
Whose duck set off the whiteness of the skin. Dryden.