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"dusk" is also used as a crossword clue. If that's what you saw, the answer is often sundown (7 letters).
Definitions
The fading light after sunset.
Word origin
From Middle English dosk, dusk(e) (“dusky”, adj.), from Old English dox (“dark, swarthy”), from Proto-Germanic *duskaz (“dark, smoky”), from Proto-Indo-European *dʰwes-, related to *dʰewh₂- (“smoke, mist, haze”). Cognate to Latin fuscus (“dark, dusky”), Sanskrit धूसर (dhūsara, “dust-colored”), Old Irish donn (“dark”). Related to dye, dust and dun (see these for more).
Used in a sentence
“A pathless desert, dusk with horrid shades.”
“Witnessing the dusk gives a feeling of solace.”
“We caught a beautiful view of the dusk.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“Evening twilight”4 letters
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