sunsetting

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CIDE DICTIONARY

sunsetting, n.

The descent of the sun below the horizon; also, the time when the sun sets; evening. Also used figuratively. [1913 Webster]
"'T is the sunset of life gives me mystical lore." [1913 Webster]
Hence, the region where the sun sets; the west. [1913 Webster]

Sunset shell (Zoöl.), 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.