What is the meaning of overcast?

noun

• The state of the sky when it is covered by clouds.
  • synonyms: cloudiness, cloud cover
• Gloomy semidarkness caused by cloud cover.
  • synonyms: cloudiness
• A long whipstitch or overhand stitch overlying an edge to prevent raveling.
  • synonyms: overcasting
• A cast that falls beyond the intended spot.

verb

• Make overcast or cloudy.
  • usage: "Fall weather often overcasts our beaches"
  • synonyms: cloud
• Sew over the edge of with long slanting wide stitches.
• Sew with an overcast stitch from one section to the next.
  • usage: "overcast books"

adjective

• Filled or abounding with clouds.
  • synonyms: cloud-covered, clouded, sunless