noun
backstitch
A sewing stitch that goes back over the previous stitch to create a strong, continuous line. Used in hand sewing and embroidery.
布の端を返し縫いで補強した。
I reinforced the edge of the fabric with backstitch.
刺繍では返し縫いがよく使われる。
Backstitch is often used in embroidery.
Compound of 返し (kaeshi, 'returning') + 縫い (nui, 'sewing'), literally 'return-stitch'. The exact historical derivation is uncertain, but the term transparently describes the back-and-forth motion of the stitch.