[n] the daily event of the sun sinking below the horizon
[n] atmospheric phenomena accompanying the daily disappearance of the sun
[n] the time in the evening at which the sun begins to fall below the horizon
[adj] of a declining industry or technology; "sunset industries"
Antonyms
aurora, break of day, break of the day, cockcrow, dawn, dawning, daybreak, dayspring, first light, morning, sunrise, sunup