noun
slip stitch; blind stitch
A hand-sewing stitch used to join two pieces of fabric invisibly from the right side, often for hems or linings.
スカートの裾をまつり縫いで仕上げる。
Finish the hem of the skirt with a slip stitch.
まつり縫いは表から見えないように縫う方法です。
A blind stitch is a method of sewing so that it is not visible from the front.
The term まつり縫い likely derives from まつる (to enshrine, to set in place) combined with 縫い (sewing), suggesting a stitch that 'sets' fabric neatly. The exact origin is uncertain.