verb (v)

• become or cause to become undone by separating the fibers or threads of(verb.contact)

  Synonym:
  unknot, unravel, unscramble, untangle
  Antonym:
  knot, ravel, tangle
  

  source: wordnet30
• undo (the stitches) of (a piece of sewing)(verb.contact)

  source: wordnet30
• To pick out; to undo by picking.(verb)

  source: webster1913