noun

• (by extension) The time period when someone or something is past its prime.
  "She has beauty still, and if it be not in its heyday, it is not yet in its autumn."
• (fashion) A person with relatively dark hair and a warm skin tone, seen as best suited to certain colours in clothing.

verb

• (intransitive) To spend the autumn (in a particular place).
  "True it is that, owing to the migratory propensities of our countrymen, every third man has wintered at Naples, springed at Vienna, summered in Switzerland, and autumned on the banks of the Lago Maggiore;"
• (ambitransitive) To (cause to) undergo the changes associated with autumn, such as leaves changing color and falling from trees.
  "The glistening path where weeds had clung, / And tumbled bushes lay, / Was hidden now, but yet there rung / Tones of an autumned May.[…]And cheers rang out, the song and shout, / For the fray had found its eve, / And pirate chief like autumned leaf, / O’er fallen pride did grieve!”"