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(Knitting & Sewing) a sewing stitch for securing hems, etc, in which only two or three threads of the material are caught up by the needle each time, so that the stitches are nearly invisible from the right side
[C19: from slip1]
a loose stitch taken between two layers of fabric, as on a facing or hem, so as to be invisible on the right or outer side.
slip′-stitch`, v.t., v.i.