"sunset" in the noun sense
1. sunset, sundown
the time in the evening at which the sun begins to fall below the horizon
atmospheric phenomena accompanying the daily disappearance of the sun
the daily event of the sun sinking below the horizon
"sunset" in the adjective sense
of a declining industry or technology
providing for termination
"a program with a sunset provision"
Source: WordNet® (An amazing lexical database of English)
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