The Collaborative International Dictionary
Sunset \Sun"set"\, Sunsetting \Sun"set`ting\, n.
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The descent of the sun below the horizon; also, the time when the sun sets; evening. Also used figuratively.
'T is the sunset of life gives me mystical lore.
--Campbell. -
Hence, the region where the sun sets; the west.
Sunset shell (Zo["o]l.), a West Indian marine bivalve ( Tellina radiata) having a smooth shell marked with radiating bands of varied colors resembling those seen at sunset or before sunrise; -- called also rising sun.
Wiktionary
vb. (present participle of sunset English)
Usage examples of "sunsetting".
Seri, who had served with her grange’s fire patrol, had told Aris which way it would burn, sunsetting, away from the city.
After a brief rest, they started off again, this time downslope and angling as much sunsetting as winterwards.
The four elder children would have liked to linger in the lane till the complete sunsetting turned the grown-up Lamb (whose Christian names I will not further weary you by repeating) into their own dear tiresome baby brother.
If I'm on the phone with Hand, and he mentions the time we pushed Darren Larson over the sprinkler -- we were big kids and bullies -- and Darren Larson cut the shit out of his shin, all that milky white showing, and then he hid behind the fence by the lake under the sunsetting sky, mewling -- then I can ask the librarian to get me all the information possible on that event, and do it quickly, so I can converse intelligently with Hand.