o·ver·cast·ing 
(ōvər-kăs′tĭng)
(ōvər-kăs′tĭng)n.
1.
a. The act of sewing raw edges of material with long, overlying stitches to prevent raveling.
b. The stitching so done.
2. The stitch used to overcast.
overcastingtop: single overcasting stitchbottom: double overcasting stitch