noun
hemming; blind stitch
A sewing technique where the stitch is hidden on the right side of the fabric, often used for hems.
スカートの裾を伏せ縫いで仕上げた。
I finished the hem of the skirt with a blind stitch.
まつり縫い is another type of blind stitch often used for hemming, but 伏せ縫い specifically refers to a stitch that is completely hidden on the right side, while まつり縫い may show tiny stitches.
From 伏せる (to lay face down, to hide) + 縫い (sewing), referring to a stitch that is hidden.