back·stitch /-ˌstɪʧ/
倒縫(vt.)(vi.)倒縫
Back·stitch n. A stitch made by setting the needle back of the end of the last stitch, and bringing it out in front of the end.
Back·stitch, v. t. To sew with backstitches; as, to backstitch a seam.
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backstitch
n : overlapping stitch made by starting next stitch at middle of
preceding one
v : do backstitches