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