blanket stitch n.
毯边锁缝针迹
blanket stitch[ noun ]
a strong reinforcing stitch for edges of blanket and other thick material; similar to buttonhole stitch
<noun.artifact>
Blanket stitch \Blanket stitch\
A buttonhole stitch worked wide apart on the edge of
material, as blankets, too thick to hem.
[Webster 1913 Suppl.]