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sunset

Listen/ˈsʌnˌsɛt/

noun

Definition: The time of day when the sun disappears below the western horizon.
    Definition: The changes in color of the sky at sunset.
      Definition: The final period of the life of a person or thing.
      Example: one's sunset years
        Definition: Having a set termination date.
        Example: The tax increase legislation included a sunset clause requiring renewal to prevent the tax increase from expiring.
          Definition: The region where the sun sets; the west.

            verb

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