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noun

• The time of day when the sun disappears below the western horizon.

• The changes in color of the sky at sunset.

• The final period of the life of a person or thing.
Example: one's sunset years

• Having a set termination date.
Example: 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.

verb

• To phase out.
Example: We'll be sunsetting version 1.9 of the software shortly after releasing version 2.0 next quarter.