v. t. 1. To cast or cover over; hence, to cloud; to darken. [ 1913 Webster ]
Those clouds that overcast your morn shall fly. Dryden. [ 1913 Webster ]
2. To compute or rate too high. Bacon. [ 1913 Webster ]
3. (Sewing) To take long, loose stitches over (the raw edges of a seam) to prevent raveling. [ 1913 Webster ]
4. (Bookbinding) To fasten, as single sheets, by overcast stitching or by folding one edge over another. [ Webster 1913 Suppl. ]
a. 1. (Meteorology) Completely or almost completely covered over with clouds; -- of the sky. [ PJC ]
2. (Sewing) Sewn by overcasting. [ PJC ]