Wordnet 3.0
NOUN (1)
1. 
 an overlapping stitch made by starting the next stitch at the middle of the preceding one; 
VERB (1)
1. 
 do backstitches; 
The Collaborative International Dictionary of English v.0.48:
Backstitch \Back"stitch`\, n. [Back, adv. + stitch.]
   A stitch made by setting the needle back of the end of the
   last stitch, and bringing it out in front of the end.
   [1913 Webster]
The Collaborative International Dictionary of English v.0.48:
Backstitch \Back"stitch`\, v. t.
   To sew with backstitches; as, to backstitch a seam.
   [1913 Webster]
WordNet (r) 3.0 (2006):
backstitch
    n 1: an overlapping stitch made by starting the next stitch at
         the middle of the preceding one
    v 1: do backstitches