Definitions of overcast:

• noun:   a cast that falls beyond the intended spot
• noun:   a long whip stitch or overhand stitch overlying an edge to prevent raveling
• noun:   gloomy semidarkness caused by cloud cover
• noun:   the state of the sky when it is covered by clouds
• verb:   make overcast or cloudy

  Example: "Fall weather often overcasts our beaches"

• verb:   sew with an overcast stitch from one section to the next

  Example: "Overcast books"

• verb:   sew over the edge of with long slanting wide stitches
• adjective:   filled or abounding with clouds
• name:  A surname (very rare: popularity rank in the U.S.: #22757)