Source : Webster's Revised Unabridged Dictionary (1913)

Overcast \O`ver*cast"\, v. t. (Bookbinding)
   To fasten, as single sheets, by overcast stitching or by
   folding one edge over another.

Overcast \O`ver*cast"\, v. t.
   1. To cast or cover over; hence, to cloud; to darken.

            Those clouds that overcast your morn shall fly.
                                                  --Dryden.

   2. To compute or rate too high. --Bacon.

   3. (Sewing) To take long, loose stitches over (the raw edges
      of a seam) to prevent raveling.

Source : WordNet®

overcast
     adj : filled or abounding with clouds [syn: {cloud-covered}, {clouded},
            {sunless}]

overcast
     n 1: the state of the sky when it is covered by clouds [syn: {cloudiness},
           {cloud cover}]
     2: gloomy semidarkness caused by cloud cover [syn: {cloudiness}]
     3: a long whip stitch or overhand stitch overlying an edge to
        prevent raveling [syn: {overcasting}]
     4: a cast that falls beyond the intended spot
     v 1: make overcast or cloudy; "Fall weather often overcasts our
          beaches" [syn: {cloud}] [ant: {clear up}]
     2: sew over the edge of with long slanting wide stitches
     3: sew with an overcast stitch from one section to the next;
        "overcast books"