Sunset /(?)/

Sun·set

Sunset

n.
  1. 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.
  2. Hence, the region where the sun sets; the west.

Phrases & Compounds
Sunset shell
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.