Definitions for backstitchˈbækˌstɪtʃ
Random House Webster's College Dictionary
stitching or a stitch in which the thread is doubled back on the preceding stitch.
(v.i.)to sew by backstitch.
Origin of backstitch:
an overlapping stitch made by starting the next stitch at the middle of the preceding one
A type of sewing stitch where the stitch goes backwards on the top side of the fabric and doubles forward on the bottom, coming out farther in front, then repeats. The backstitch is a very tight and secure stitch, and also looks very neat.
To sew with a backstitch.
a stitch made by setting the needle back of the end of the last stitch, and bringing it out in front of the end
to sew with backstitches; as, to backstitch a seam