sunset
(/ˈsʌnˌsɛt/)
noun
--The time of day when the sun disappears below the western horizon.
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--The changes in color of the sky at sunset.
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--The final period of the life of a person or thing.
"one's sunset years"
--Having a set termination date.
"The tax increase legislation included a sunset clause requiring renewal to prevent the tax increase from expiring."
--The region where the sun sets; the west.
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verb
--To phase out.
"We'll be sunsetting version 1.9 of the software shortly after releasing version 2.0 next quarter."